Of course, they can't realistically police every use of AI any more than they can police someone using Grammarly or similar tools. I think the core of the argument is really about drawing a hard line against low-quality "write a response for me" type usage.
In reality, people are going to keep doing that no matter what. But at the same time, it's still probably a worthwhile line to draw when it comes to discouraging more irresponsible or disengaged uses of AI.
Ten times shorter just means "readable without losing an excess of time on ramble" and I feel like someone's comeback to this will be "you should ask an AI to summarise".
In reality, people are going to keep doing that no matter what. But at the same time, it's still probably a worthwhile line to draw when it comes to discouraging more irresponsible or disengaged uses of AI.