I don't remember ever being asked about my health during a job interview. I was asked about it on day 1 of my current job, but they only asked if there was anything they needed to know -- they didn't ask for any signatures or certificates. Of course, in other countries, the law will be different.
One advantage of not having an official autism diagnosis and not having my name tied to this Fedi alias is that it's hard for an employer to find out until and unless I chose to tell them.
(At some point soon, I'll finish the process of splitting my Fedi presence in two. At that point, I'll change both my profile pictures and alter my writing style slightly on this account so that it's less like the style I use with friends and at work. It'll still be me.)