So the advice would be "don't trust bad Grolsch bottles", right? "don't trust bad (or potentially bad) Grolsch bottle cap seals"
This seems like more of a perceived risk to me than a real one. IME, I have never had carbonation problems with Grolsch bottles and they seal well enough for bottles to crack when they are overcarbed.
If the rubber gasket is dried out, it will be obvious. I haven't had any dried gaskets that I can recall except when I received a batch of OLD bottles that hadn't been used in maybe 20 years.
You might as well just give advice to say "don't use chipped or cracked bottles or rusty caps."