I quote fromt he study you linked:
"The incidence is estimated at 10–30% of non-hospitalized cases, 50–70% of hospitalized cases"
It specifically states in no uncertain terms that the higher ranges above 50% were only in the case of hospialized patients, and for non-hospitalized diagnosed people it is 10-30%.
This also implies that the non-diagnosed asymptomatic crowd, which is not in this study would be even lower, implying the overall number once those people are factored in is likely to be lower still.
But as is very cleraly stated in the metareview what you said is straight up false, no study suggests an 80% figure for all people who catch covid.