It's not limited to textbooks or academic publications, or based on any context whatsoever, but an ngram search actually suggests there's a much larger musk stain on recent published literature than I'd ever thought possible:
https://books.google.com/ngrams/graph?content=Elon+Musk%2CAl...
Make of that what you will.
I don't understand how to filter this to physics books
I wasn't trying to imply that, simply noting that there was a surprising amount of literary chatter about Musk, at high levels compared to commonly cited physicists. It's not the most useful comparison.
It could easily be people writing fanfic about him (ugh) or criticising the pants off him, and may not be related at all. But I'd guess a lot of this was field-adjacent to at least his business interests.