In many places, yes, US pedestrian infrastructure is worse.

In other ways - wheelchair accessibility for example - the US is miles better than many European cities.

Wheelchair users are a subset of pedestrians. If your pedestrian infra is shit, your wheelchain infra can't be much better. (Sure, only if you count whatever remains of pedestrians infra, it might look acceptable).

Sort of but not entirely. While bad pedestrian infrastructure sucks, usually I can get around it.

But I’ve been in crutches and a wheelchair many times in a life —- if the actual place is not wheelchair friendly, it is much harder to get around.

A vast majority of wheelchair users in the US are car users.