You're right, unfortunately I fell prey to the same knee-jerk instinct that I'm calling out! It would've been more accurate for me to say he's free to publish these views in any other avenue, if not the episodes.
Is he though? I suspect Spotify owns the rights to those episodes and to his show, so I doubt he is free to publish these views in another avenue. Spotify wouldn't pay $100M and not contractually lock up all of those rights.
It's meaningless to speculate but I doubt Spotify can stop Joe Rogan from repeating any of the assertions made in his podcasts on, say, Twitter, or at live events, or in a bar. In terms of whether this is an issue of freedom of speech, the point is he has the same rights as he had yesterday.
But even still, its censorship Rogan opted into to get $$$.