LOL what is misleading exactly ? This is what Pimax states:
They don't claim it's 90 hz. They claim your brain perceives it like 180 hz. Which I doubt btw, but it might look better than 90 hz IF they synthesize one eye because then really it kind of IS 180 hz because then it actually displays 180x per second a different frame, just not for both eyes.
Personally I think it's not going to work as good as Pimax claims though.