Google doesnt turn on MV3 and have it break ads day one that would highlight a negative change for users. Google wants people to move to MV3 and notice no difference and then they can start chipping away later.
It's cute that you think they have level of sophistication in their strategy.
It doesnt require sophistication. Just implement MV3 and then when the conversation about adblockers comes up make a note that its probably not wise to cut it as extensions have switched to MV3 and its a controversial topic. Its easy to see how different teams would come to this without collaborating, its the MV3 team doing what they do and the ad block team reading the room.