As an outsider to the USA housing market (that seems to be very heavily regulated), could someone explain the significance of what is alleged here? More to the point, why are multi-listings of whole houses a bad thing?
Many people unhappy with AirBnB want to portray AirBnB as primarily a means for large-scale commercial landlords to circumvent regulations on hotels, renting, or subletting; such a depiction makes it easier to argue for more regulation. A large number of people posting multiple "entire home" listings would lend support to that depiction.
AirBnB wants to portray themselves as primarily letting individual people rent out their own property or rooms; such a depiction makes it easier to argue against existing or additional regulations. A large number of people posting only a single "entire home" listing, or listings of individual rooms in a home, would lend support to that depiction.
The site linked here claims that AirBnB removed many "entire home" listings from their site right before producing a report, and that the removed listings disproportionately reduced the number of listings by people with more than one "entire home" listing. The linked site further claims that those removals only occurred in NYC, and the graph suggests that the proportion immediately started growing again after the removals and subsequent report.