The debriefing, as an in-universe document, can contain errors. Being ready does not necessarily equate to the op being compromised.
It also dismisses out of hand the possibility that the operation was compromised by a Vasudan, which seems much more likely than that it was compromised by a UEF officer.
Somebody got an agent aboard the UEF VIP transport, though.
Yeah, that part still baffles me a bit. It's one thing for the meeting location to be compromised--Vasudans, easy explanation. But how did they find out which ship was going to be used? How did they get aboard? How did they get a pocket nuke aboard, and in Engineering?
And after that, why did the second transport stop several clicks away from the shuttle to receive the Elder? They were in a compromised combat zone, with a whole lot of suspicious activity. Did they really think flying a paper-mache shuttle several kilometers through the open with a small escort was the right way to go about it?
Somehow, the UEF seems to be rather seriously compromised by the GTVA's SOC--if they can get an agent with a pocket nuke aboard a high-security transport that's been randomly selected on short notice for a top-secret mission involving an Elder, could they get an agent with a pocket-nuke aboard an Oculus? In the Main Engineering of, say, the Eris? Or a random Karuna?