In other words the idea might have the opposite effect - keeping potential new human users out, but allowing the bots in
The galaxy brain shit here is that I suspect the bot problem actually doesn't concern Musk in the way he claims. If he can make it seem like there are fewer bots (because of these policies) while at the same time not actually getting rid of them, the engagement level stays up and the advertisers are happy in their ignorance. Bots are better users: they're not fickle, they don't go to sleep, they can be reliably expected to be posting more regularly than normal users. The trick for Musk is convincing everyone they're gone.