I would think so. The difference with cancelling a long-term stay is that it’s treated as ongoing, so leaving is more a “giving notice to end the stay” rather than a cancellation, even though we have used the word “cancel”. Air call it an “alteration” (better). So if you wish to leave early, you’d be paying the penalty even if you leave immediately. Here is what they quote:
If the guest books a reservation and decides to cancel the reservation during their stay, the guest must use the online alteration tool in order to agree to a new checkout date. Regardless of the checkout date chosen, the guest is required to pay the host for the 30 days following the cancellation date, or up to the end date of the guest’s original reservation if the remaining portion of the original reservation is less than 30 days.
So the “right” way to cancel is to do it 30+ days in advance, allowing you to choose your actual “last day of stay” to be the same as the last day you pay for, if that makes sense.
Note that here the “cancellation date” is not the day you intend to leave but the day you go into the system to give notice.