I'm autistic and both me and my autistic friends call ourselves retarded all the time lol. I'd rather be called that than "neurodiverse" or whatever the euphemism treadmill has come up with.
(As an aside, it's also an engineering term, for it's original meaning, slow down)
Whatever you think of the tertiary organisations, it seems like you're better off donating directly to a cause that needs it, rather than funding a bunch of middle managers to give it to someone else.
A compromise would be to require a text summary of any video post.