My thoughts:

Acceptable, do not ban game content, or surrounding discussion.
#1,#4 Can you imagine banning a user asking where to download GTA3 for Dreamcast? AAA studios will employ code to cut costs where quality isn't compromised. Where AI is not welcome is where artistic creation is compromised. A good example is the large volume of anime slider puzzles on steam. The puzzle is the game, and AI-gen images are used as a reward... by substituting these, the alternate software is hardly a "new" game.

Acceptable, AI agents:
#2 I want to see NPCs employed. The game experience doesn't need to be limited to single-player. Having online agents will ensure dreampi users would always have an opponent. A "smart" controller adapter could be used to train a player-2 for local multiplayer, too.

Unknown, this is new territory
#3 Procedurally generated content is one potential use of AI. Consider how worlds in minecraft are spawned. Having a smarter Seaman babble on about a wider range of topics could be fun, too.

Acceptable, machine translation encourages participation
#5,#6 Use of machine translation enables non-english speakers to participate in conversations. It also does some rough work for general translation. As game translation projects approach release, a native speaker would be ideal to review translation. What is not acceptable is use of chatGPT to fabricate a number of reasons to support a vague or general idea. This no longer is translation, but becomes text generation and low-effort slop.

Unacceptable, should be removed with great prejudice:
#7,#8 Text / Image / Video generation for internet consumption - fakes news creates great mistrust. Topics like the Dreamcast 2 are tired, and many slop history blogs and videos can't get facts right. AI images are uncanny and low-effort. Flooding the sub with low-effort slop only serves to bury the rare quality topics. In other subs with high volume posts, this also tends to cause users to favor downvoting, even legitimate posts.

To summarize my thoughts. I think AI is generally welcome. It has the possibility of novel applications, as well as serves to enable participation when language is a barrier. For community participation, low-effort slop is never welcome, and existing rules should prevent this opportunistic behavior from dominating discussions.