Hi! First time poster here. Any news on this? I'm having a Sorian AI issue as well, and just wanted to check to see whether I should open a new thread, as I'm not sure whether this issue is related.
I just played two 6v6 matches (6 humans vs 6 Sorian AIX), and the AI did nothing but build tech 1 units (and did not upgrade any of its buildings beyond this). They definitely are attacking now, though (although on Seton's multiple AI piled up a bunch of tech 1 ships in the NE part of the North ocean rather than strike with them). The two maps were Seton's Clutch EP and Diversity EP.
Regardless, thanks for the work y'all do/have done!