There is weird politicking and bizarre bedfellows happening in Turkish politics right now. Erdogan's allies to his right are advocating for Ocalan's release as some sort of diplomatic manuever. Ocalan's own nephew I believe has made it into parliament as a relatively outspoken Kurd, and I imagine he is doing the same for more personal reasons.
Meanwhile Ocalan has been pumping out some of the most excitingly radical and revolutionary libertarian socialist ideological literary material in the world in our lifetimes from solitary confinement (Yes it's torture) over the past 15 years, springboarding off the ideas of Murray Bookchin and instructing the PKK to abandon Marxism in favor of Democratic Confederalism, which they mostly appear to have done despite Kurdish culture's continued cult of personality around him. I can't help but wonder if this is a test: Turkey wants him to say one thing publicly, and he's hedging his bets that his comrades will know to not listen.
freeocalan.org has collected a bunch of them here: ocalanbooks.com