Pangram’s market claims are very different from independent validations of the platform. The 99.98% rate is on a toy dataset not resembling reality.
Even if 2/10000 is true that’s nowhere near accurate enough to make aggressive accusations that create anxiety at levels people need to medicate with potentially fatal consequences.
Someone also input lots of pre-GPT texts to Pangram and they were all clear. The point is Kramnik’s claims are much weaker and not comparable.