They are trying to get off or have gotten off their kernel fork called "Prodkernel" for some time now.
https://lwn.net/Articles/871195/ https://events.linuxfoundation.org/wp-content/uploads/2022/0...
https://lwn.net/Articles/871195/ https://events.linuxfoundation.org/wp-content/uploads/2022/0...
The change being talked here is moving from merge ~2 years to merge all the time. Saying they're stuck on something from 1999 is ridiculous.