What they were saying is simply common sense. If an airbnb host is buying a local unit and renting it out for high prices to tourists, they're going to buy it for a higher price than someone who's simply there to live, and that's stealing the opportunity for someone to live somewhere within their means.

You don't need to be a communist to understand that it's bad for everyone to prioritize entertainment travel over the ability to afford housing in the city that you live.