The lack of full data is because tournaments keep Hawk-Eye (https://en.wikipedia.org/wiki/Hawk-Eye) data to themselves right?
Certainly it does pace. But from the article it's hard to say if it would track spin - it's not clear to me that with the natural markings on the ball (seam lines + ballmaker logo) and the lighting that exists in the stadium, that would be enough fidelity for some algorithm to calculate the spin.
I think Hawkeye could be updated to easily do it though, and maybe if they would be willing to draw 1 or 2 black dot markers on the ball in addition to the natural markings.
Additionally spin is a big part of the trajectory model - the Hawkeye cameras are only 60fps, so the trajectory is interpolated.
However, I doubt it’s the cameras measuring spin. It’s more likely spin is a free variable when they fit the trajectory.
Very interesting read, but I'm not knowledgeable enough to really give you an accurate tldr, sorry