That blog post is awful. Not a response to you but to the post itself:

Chloe is physically disabled and has lost sensation in one of her legs from an accident in 2005 or so. She wears the brace on her leg to actually help with her physical disability. Given that information, she likely uses the wheelchair not only because she wants that leg paralyzed (not paraplegia), but also because she finds it beneficial to use a wheelchair given her existing disability.

Not only is the blog post insulting, it gets several facts about her completely wrong.

And also, anyone who wants to use a wheelchair should be able to, for any reason. Making people justify why they need one just creates needless barriers for many of us who do need one for any reason (in my case, my inability to walk more than a short distance). I'd rather any number of people with BIID who do not technically need a wheelchair for physical reasons be able to use one than risk people who technically do need one being unable to get one. And I'd argue actual need is important, and in that case many people with BIID have an actual need for the well-being and relief they get from using one.