I suggest you read the "Stellaris is Way too Unfair" thread, where you directly tell another forum goer that the AI doesn't get any resource buffs on normal, that it is simply better at managing its economy than the player in question.
The reality is that "paying less maintenance" is an economic buff. If you're paying 20% of your mineral income on your fleet, that's a substantial amount. Even more noticeable in the new update, but even pre-2.0 100 naked corvettes would have a maintenance of what 50 minerals a month?
Current game: My Rethellian Coalition has mineral expenditure on ships of 556 per month. 50% of that gives the equivalent AI next to me an extra 278 minerals per month to spend on stuff, including ships. That's huge.
You've been pretty rude to players on these forums about this issue. It would be lovely in future if you:
a) did not lie by omission,
b) did not deride players who suspect that the AI is cheating (because yes, free resources is cheating, it doesn't matter if its a console hack or a If(AI) then (0.5*Maintenance Cost)
c) were upfront and honest about the advantages the AI is getting, especially if players are saying "I suspect the AI is getting free resources"
I will agree that saying it did not get resource buffs was poorly worded, and I apologize if I was misleading. The thread in question claimed that AI empires simply get fleets gifted to them, however, which it really does not. Honestly, I didn't see the mineral maintenance discount as having any real significance before 2.0 because mineral maintenance from fleets was rarely a very big deal. Nowadays it very much is.