He said that science is not settled by open debate. A reasonable response to that would be to ask how it's settled. Is it to be settled by closed debate? Then that gives you science behind closed doors, subject to gatekeepers. Is it to be settled by some open process that is not debate? That violates testability, which is one of the key features of the scientific process.
Science is inherently open. Therefore the distinction between "open" and "closed" science doesn't even seem to be a relevant question. By definition there can be no "closed science" - although commercial R&D facilities could fall under this, they typically still publish their major research in the open science community.
Science is done in open fora. It goes through pretty strict peer review before it is published, typically in field-specific journal or letter magazines. These are all accessible to both general public AND media, although usually not for gratis.
The reason why science often appears to be "closed" process is that most of it is very specialized. Scientific papers require quite a bit of expertise on the topic to be legible.
What ends up filtering to general public through mass media (news organizations, mainly) is typically either a journalist's spectacularly grandiose embellishment of some research publication that happens to seem like it would make a good headline, OR a sensationalist claim made by non-scientists to get publicity to their "research" which hasn't passed the peer review process (either rejected, or never even submitted) but the journalists don't have the expertise to distinguish it for what it is, and end up publishing it anyway. And the next thing you know, all the news aggregate sites blindly copy the text verbatim from page to page and then it ends up in wikipedia until some ardent editor looks at it, notices that there's no actual scientific published source claiming this, and removes it.
The distinction here is not between open and closed, but whether general public has any valuable input to matters of science.
They don't.
Individuals in the crowd can certainly have enough knowledge and understanding of the topic to know what's being talked of, and to even generally form an opinion on where a particular research is applicable, but in general, a random sampling of general population
even in the most educated countries in the world would fail to provide any meaningful input in the vast majority of scientific research.
That's why they are not involved in the process. If someone is interested in participating in the scientific process, they are expected to give the science the courtesy of educating themselves to a level where their input can be meaningful and make a difference.
Sadly in many countries this is not an option for majority due to economic constraints. Ideally, university level education should be free of tuition fees and funded by the state budget. But that's another, political issue.
Science, as it's being made, has very little to give to general public.
General public has nothing to give to science, as it's being made.
The end results turns out to be - predictably - that most scientists don't really consider how general public perceives science and scientific community, and vice versa the general public knows very little about how science is made, and makes random guesses as to how it must be (generally based on popular culture depictions of scientists, which are typically based on how the creators of that particular thing perceived scientists).
There are some rare people in the scientific community who actually have consideration to how the general public perceives science. Some of them have the drive to educate, good writing and oratory talents, and enough charisma to appear in prime time TV. To these rare specimens falls the
majority of the unenviable task of popularizing science. Among them are individuals such as Stephen Hawking, Carl Sagan, Stephen Jay Gould, Neil deGrasse Tyson, and indeed Bill Nye.
It's not like we're all walking around underground particle physics facilities wearing lab coats, wearing horn-rimmed glasses and waving crow bars at violently hostile anomalies (only some of us have to do that).
So that's why public debates have no relevance to science.
Politics, however, is a completely different thing. It turns out, in many countries, research funding requires a bit of politicizing, especially on the large scale. And, as a result, the few scientists who end up being the "representatives" of science at their time, end up being involved in politics and that includes trying to convince ignorant people that giving money to the research will benefit them.
That's where debates like this come into the picture...