But I'm not calling them liars. Gary and Frank say that, on multiple occasions, there were no PC deaths. I'm giving the benefit of the doubt that, in fact, no PCs met their death in a given number of ToH runs.
However, there might be a bit of behind-the-scenes shenanigans going on whereby "No PC Deaths" means "Thousands of nameless NPCs died so that the PCs didn't have to."
In other words, "No PC deaths" may not be the whole story, and concealing the rest of the story might be intellectually dishonest.
EDIT:
Heck, "No PC Deaths" could, in fact, mean "The PCs entered alone, fought and puzzled their way through, and won the day - all without a single PC death!"
Given other sources, however, I doubt it. But I'm leaving open the possibility that I'm wrong.