"Equal access" is not free. If universities are given the choice of not providing free educational resources and paying shit-tons of money to provide free educational resources accessible to every random group that sues the university over the way these free materials are presented, universities will obviously choose not to offer free educational resources.
Old joke:
A marxist economist meets a market economist at a conference. After listening to an exposition on Smith and Hayek he nods vigorously and says "Yes, yes! I know it works in fact but does it work in theory?"
I suppose it rests on the definition of reasonable accommodation which could range anywhere from "making the material available for transcription" to "full professional subtitles should be made available".
It sure was applied to buildings that were built before the ADA was passed.
And what videos of interest would those be? Ableson and Sussman's SICP/6.001 lectures come to mind, and some Feynman lectures I assume are that old.
"Or a private conversation that was published."
Well, aren't we about to find that out in the legal arena?
You're only escape is "private", which suggests it should not be published at all. Especially in a two-party consent state like Massachusetts.