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It looks like he's posting on his blog and maybe it cross-posts to linkedin:

Yes, I can't find the episode now, but on the 37signals podcast, Jason and DHH said that driving signups with public writing are part of their job that they owe to their employees, and that includes presence on places they don't really like such as Linkedin.

He seems to be quite active on there. I think he also has a blog on hey.com but that's blocked at my employer as it's an email domain.

Oh, that blocking is most likely the reason, then, which does make sense. He posted a more complete version to hey.com:

https://world.hey.com/dhh/apple-does-ai-as-microsoft-did-mob...