The wheelchair one (whilst obvious hyperbole) is a great example of why this rhetoric isn't useful.

Often people who say we should plan walkable cities don't consider what that would mean for wheelchair users and other disabled people, because they don't have the lived experience to think along those lines. So it would actually be super useful if someone could say "okay, but what about wheelchair users?" in a constructive way, because there are additional considerations re: pedestrianisation and public transport. Disabled people are way too often treated like an inconvenience or obstacles to progress, and that's fucking exhausting, so it's useful to have allies who ask "hey, what about disabled people tho"

The people your comment is about don't do this. As you highlight, they make things about themselves, and if anything, this makes it harder to have productive conversations about what a 'walkable city' for everyone would look like. I suspect that for many of these people, it's based on a nugget of good intentions inside a blob of insecurity and dread at the state of the world; they feel like they're not doing enough so they resort to very loudly virtue signalling in the most bizarre ways.