I just had a look. Mind you, they don't state it as SWL on either the tree huggers or what they call strong webbing, it's a recommendation. The strong webbing will hold massive weights even with fraying, I agree with you about cuts though, but cuts haven't been mentioned. My hammock has similar, probably the same webbing, and it does catch and fray. So far, nowhere near the point where I'd consider it unsafe.
However, the stuff is available online and isn't at all expensive, so if the OP is worried, it can easily be replaced.