In case anyone was randomly curious. I contacted THQNordic when Tach was on sale at GOG, trying to see since they listed it as multiplayer and working on Win 10 (which it does, just have to beat it around)
however eventually ended up at THQ.
Basically their response was that support has no information on patches, DLC, or whatever, that is part of Production, and they forwarded my mail to them. It's been around a week and no reply.
I also requested information on whom to contact about game IP licensing, should we get to a place where we can produce something of value, sometime in the future. But no reply to that either.
Overall, at least they replied, unlike Novalogic. But still no real support.
GOG considers IPX based LAN as "multiplayer" which is baloney... but uh... yeah. Evidently the GOG version of Tachyon also comes with NGlide, which not sure how that works with a paid product and such, but
we were the first ones to tell and show folks how to use Glide wrappers with Tachyon so, I guess in a roundabout way we enacted change for the better.