Also, in their Q4 Report [0] they are using this wording,
"Added thousands of tutorials, guides and educational content through the acquisition of CSS-Tricks and JournalDev."
Back when DO acquired Scotch.io, they only migrated the best / most popular tutorials, and I wouldn't be surprised this is the fate for CSS-Tricks also. I think there are thousands of published pages on CSS-Tricks, many of which already overlap with what DO has written over the years, and on top of that - it would involve some serious work to migrate everything.
Again, these are just my thoughts on it, but why else would they just kick Geoff off the team like that?
[0]: https://www.businesswire.com/news/home/20230215005423/en/Dig...