I think people in the industry say that they can. And one brand of rim doing static tests with a Giant's special carbon bead tire doesn't make the other industry peoples' assertion go away.
https://www.giant-bicycles.com/ca/hookless-technology

If YOU want to ride hookless at over recommended pressure, sounds like you should go with Giant rims and matching tires, because Giant is not claiming this is safe in general but just with their product. And actually, Giant isn't claiming you can ride 72 psi, just that they did tests above that pressure without anyone riding.