This AI detection policy as stated seems acceptable. However, it is the success of heuristics that will ultimately make it stand or not.
If the approved heuristics would not allow moderators to successfully moderate (remove) AI generated posts as they were able to do initially, then all this work will be in vain.
The signal that AI generated content is not acceptable on sites in the network (I accept that there may be different rules on different sites) must be strong enough to act as a preventive measure. If users see that moderator'smoderators' hands are tied, we will not be able to stop the flood of AI generated content that will inevitably ruin the quality and reputation of the sites in the network.
I hope that this will be taken into account when determining heuristics, especially the weak ones.
AdditionalAn additional question is whether there will be more a prominent warning implemented to let posters know that the AI content is forbidden before they actually post such content? It is fairly obvious, due to the amount of AI posts on Stack Overflow, that featured policy postthe featured policy post on Stack Overflow Meta and article in Help centerthe article in the Help center are not sufficient.