Definitely disagreeing on your assessment of probability there. In a room of 23 people, the chances of two people having the exact same birthday as each other, a 1 in 365 chance, is ~50%. Probability starts getting like that when there is more than one success state. Think of it this way, when you cancel out SWATs that happened in the same day, and ones that happened before the AirBnB listing, you're probably left with ~25-30 days that he got SWATted that the AirBnB was also active. From the reviews, it seems like it's pretty active, so for argument's sake, we'll say 50%, but I'll show that even with a MUCH less frequent schedule, it's still weird. Now, imagine flipping a coin somewhere between 25 and 30 times, and every single time, without fail, it was ALWAYS heads. Would you assume they really were that lucky, or that the coin had been tampered with in some way?
Let's move over to cover our bases in case his rental isn't booked nearly as often. We'll say every one in six days, he's got someone there. The chances of rolling a 6 sided die 25 times and never once rolling a 6 is almost exactly 1%. That's the kind of math you're looking at if he's not too booked, a low number of SWAT days happened during this listing, and they're coming in completely random, as in someone who doesn't know the status of his AirBnB occupancy already is the one ordering them.