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For their estimated prevalence they take reported PCR results and extrapolate for that region. They make geographical adjustments for vaccine uptake.
https://covid.joinzoe.com/post/covid-estimates-revised-after-change-to-methodology
Others seem to be confusing the methodology they use for researching symptoms with the methodology they use for prevalence which aren't the same
greentricky
The method they use is intended to estimate asymptomatic infections too, so doesn't just send tests to people who think they might have Covid. But sure, I have no idea on how rigorous their actual methods are.
Edit: I explained that really poorly. They do not look for asymptomatic cases, more that they look for people reporting symptoms who do not have Covid as much as they are interested in the people who do.