The only source of this relatoinship reveal was Sanity, they did it in the tweet thread as well, and it was the first line of their blog post. They didn't say "well it emerged on X that we were the vendor for this", it appears to done without permission. If that's the case, it is beyond unclassy. They could have simply reciprocated the disconnection, not mentioned there was a relationship, and said in their own posts "some recent blogging and tweeting have started an interesting discussion about replacing CMS, and here's our take...".
Clients will be interested enough about these things to read every post when the reveal happens from the vendor side. I read every post on that thread, saw lots of people asking who it was. Leerob never revealed who it was or even hinted. But I never saw a tweet from either party that said "We talked about it among ourselves and decided it would be interesting for both of us and our communities to reveal that Sanity was the vendor of the CMS, and they have a take about how this has impacted them, which you can read at (url)".
None of that matters now. Only the doxx matters now. Lawyers salivate over these moments.
BTW this isn't the tenth time that moving to a mental model of "something as code" has completely and upsettingly (for some) disrupted a market, even before AI.