The thread link points to the fixes and enhancements brought by the December update. At the same time thereโs also a feature drop for Pixel devices, a summary of which you can see below:
For now, Video Boost seems to be exclusive to the Pixel 8 Pro despite it being done on the cloud.
I donโt have a Pixel Watch so I donโt really know, but maybe ask in a new thread for more visibility and hopefully someone who knows could answer you?