I’ve read the whole thing and Sajin says the same claims. But again, you could argue it’s contradicted by Bambi managing some scratch damage on him and Guy being way above anything remotely that Sajin has tanked.It should be noted that the info page for the technique straight up says they can take any kind of damage.
Yeah you could say that's hyperbole but it is the official description of the technique.
The whole thing in case you're curious.
This is the equivalent of arguing Itachi can counter any attack with his Susano’o’ Yata Mirror