I think the issue is that Google has both A) a track record of backdooring restrictions on adblocking, and B) an overwhelming motivation to do so seeing as how they generate their revenue from online advertising. They've forfeited the benefit of the doubt, especially when they've already disclosed that the whole point of the change is to enhance the profitability of online advertising:
Google's engineers elaborate, "Websites funded by ads require proof that their users are human and not bots...Social websites need to differentiate between real user engagement and fake engagement"
So given that once implemented, this hop and this skip would just require a teensy jump in order to further restrict adblocking, it is reasonable to assume that's within their desired goals.
Are you really certain that Google is trying to eliminate adblocking is just an alarmist assumption?