Bunch of garbage. Enabling tourists to stay in different neighborhoods doesn't grow the economy, it just shifts where some of the money is spent from midtown to downtown.
Actually, I stayed in an AirBnB room for something like $20 a night in east Williamsburg while looking for a long-term apartment. It was cheaper than staying with a friend in White Plains and commuting on Metro-North every day. Not tourism $$, but darned useful to people moving to a new city.
Without access to the report it seems that any discussion is difficult. I think the only thing you can say is that OP is "ignoring the fact that metro.us reported HR&A's claims to have made the following findings:"