I don't think anyone is lying. I would just like to understand the whole story in context.
I am fortunate in that I don't have any medical conditions that make this discussion relevant to my situation.
That said, there is more at work than "lying on the form so you can dive." Information disclosed on the WRSTC form isn't, by law, protected or confidential, and could be more broadly disclosed than appropriate. Someone who checks one of the "yes" boxes is supposed to have a physician's statement. How recently? At what cost to the diver? From what sort of physician? For someone whose medical condition is unremarkable and stable, is it reasonable that they seek out a physician who is knowledgeable about diving every year and perhaps go through (and pay for) a battery of tests that would not otherwise be necessary? Why does the charter operator have the standing to require this?
Diving isn't special enough or unique enough to have the expectation that established divers with well-understood, common medical conditions that are well controlled, need to be disclosed in detail to every operator. Any more than people should be expected to disclose their medical history to commercial airlines prior to every flight, or before hiking a 14er, or going duck hunting at a resort.