Could be. Lots of people don't like the rights deals with these streaming services.So what you're saying is that he wanted his music off of Spotify a long time ago and due you a contract couldn't my guess would be that he doesn't own all the rights to his music so he just waited for a reason he could use. He's not all about pro-vax and medical misinformation but used them as the reason.
He is very pro-vax though, from what I know, given his history with polio.