Excuse me. Read again what they say.
Most HPV infections have no signs or symptoms; therefore, most infected persons are unaware they are infected,
And then they claim 80% of women have had the virus by age 50? And most have no symptoms? That's not statistics. That's "guesstimates".
No, it's not a "guesstimate," it's an approximation informed by random-sample testing of the general population. Just because HPV has no symptoms doesn't mean it can't be detected by an HPV test.