'Airbnb Inc. disputed the study’s findings, calling them “wrong on the facts” and containing “substantive issues with the methodology.”' Did Airbnb publish what these wrong facts and substantive issues are?
Two problems mentioned in the rebuttal: the study counts every Airbnb unit as a rental taken permanently off the market, and the dataset counts every blocked-off calendar date as a night the unit was booked. Both of those are obvious over-counting. A study that doesn't even try to account for those is pretty obviously political. Airbnb should have posted estimates of how much this over-counting could distort the data…
Whether it's $100MM or $616M - it's a sign that there are external costs that that city and society must shoulder because of the higher prices people can charge with shorter-term rentals, primarily to non-locals who may or may not be staying or moving to the city.