Yes, if the Airbnb hosts rents out additional rooms. Now those rooms have additional cars where without those renters, only the owner would have one (or two) cars.
But why wouldn't whoever was renting those rooms long-term have a car?
If you're comparing "single person in a house with multiple bedrooms" to "multiple people in a house with multiple bedrooms", then it's fairly obvious that the latter case would have park more cars on average.
But if there are people renting those rooms, I don't see how it matters if they're there for the weekend or for a year.
Not all people who host on Airbnb would rent those same rooms out long term though. It is common for people to live in a home and not have every bedroom occupied by a car owning adult. Sometimes the extra rooms are used as offices or guest bedrooms or children's bedrooms. I have no idea when my neighbor would be doing otherwise.
My point though was less about Airbnb causing the problem and more about stating that city officials need to think about how these sorts of scenarios affect citizens when they are making planning decisions.
Would there be enough parking with all of the bedrooms in this complex were occupied by a driving adult?
Or what happens when the condo design had to include a two-car garage, but tenants use the garage as storage and then park on the street?
I am based in Spain where we are not so car centric (most people I know don't own one, and parking in cities is a pain). The one time we used Airbnb, we hired a car as well to get to the location, so I agree it probably adds more car pressure.
If you're comparing "single person in a house with multiple bedrooms" to "multiple people in a house with multiple bedrooms", then it's fairly obvious that the latter case would have park more cars on average.
But if there are people renting those rooms, I don't see how it matters if they're there for the weekend or for a year.