That's true, but the point that many made (and is correct) is that many forms of content cannot be advertised upon under the new policy. In fact, depending upon how YouTube interprets the policy, they can probably block monetization on any video they want, and still claim to be merely enforcing the policy. Finally, it's quite unlikely that this policy will be implemented fairly. If you want evidence, merely know that one of the most viewed videos on YouTube is Nicky Minaj's "Anaconda," which is rife with policy violations, but is on a VEVO channel, and thus technically published by part of YouTube itself.

Do you think they'll be blocking monetization on that?

No, it's not evidence, but until serious enforcing happens, it's the best I can do, and I think it's a reasonable assumption to make.