Comment by DonaldPShimoda

Translating LaTeX to HTML is not a straightforward process, unfortunately. Many people have tried to implement automated translation systems, but nothing has really worked out yet.

I think it's unfair to expect the research team to invest additional hours in learning how to make good websites, so to solve your problem would require hiring additional talent whose only job is to translate academic PDFs into accessible web pages. I don't think that's a bad idea, and certainly Google has the funds to do something like that, but I don't imagine they'd find it to be a good use of money. Accessibility is an afterthought for most major companies these days.