A decade ago, when chat bots were a lot less useful, a common piece of etiquette was that it's fine for a bot to pretend to be a human or God or whatever, but if you directly ask it if it's a bot it has to confirm that. Basically of the bot version of that myth about undercover cops. I don't see a downside in requiring public-facing bots to do that Not sure if that's what the proposal is about though, it's currently…
It bothers me that they didn't consider that this should be bilateral: a bot must confirm that it is a bot, and a human must confirm it is a human. I wouldn't want humans pretending to be bots, for a variety of reasons.
It might work in more limited contexts, like commercial speech.