I find the fact that the surface has the potential to exacerbate injuries which occur, but not to be a factor in causing any which otherwise would not have occurred, to be very strange.
Hamstrings are one listed, for example. It could be that the faster surface factors into hamstring tears because people are spending more time sprinting at high speed, but why would that only affect the severity and not the number?
In NFL, for example, players destroy knees or ankles because their feet hit the turf and don't move where the turf would give way if it was real.
So that's the kind of thing I imagine is at play here.