Legitimately think that they simply did not think the proposal through. It was pretty nakedly an attempt to push back at radical echo-chamber communities, without understanding that rules cut both ways, and in the process of trying to justify and clarify it without being 'ideological', managed to just highlight how absurd the proposed rule was to begin with.
The two big problems with .world's admins is that they're very much amateurs (which is a hard thing to avoid in our scenario here), and that they, like many centrists, have trouble discerning where their ideology begins and ends. They feel the need to phrase things in 'fair' and non-discriminatory terms, but in doing so, often blunder into self-contradictory positions, because ultimately, discrimination (in the sense of discerning and marking) between views is what all rules are based on. The kind of "The law is the law" attitude that people who are accustomed to following, but not making, law, are prone to. One hopes that a mixture of experience and pushback will improve them, with time.
But yeah, had they implemented that, they'd go more auth and right, and I'd probably be packing up all my comms to go to another instance. Again.