I think you are spot on.
Tesla has already sunk a lot of money into the V2 sites. If the operating costs are low enough and the charging revenue is adequate, there is no reason to yank them out. We do not know how much (if any) rent that motel charges. Repair and maintenance labor is ongoing (almost a fixed cost) to service all locations within a geographic area, so really the only additional costs would be parts.
Redundancy in locations like this is a good thing. One, it serves as a backup if the V3 station down the road is offline. Two, it allows for convenient overflow when there are ultra busy travel days during vacations and holidays. Tesla has a history of keeping V2 locations when a V3 pops up close by: Kingman, Flagstaff, Nephi, Billings, Bozeman, Butte, Missoula, and Superior (120kW, even!) come to mind.
And, sometimes, we (I) don't mind the 70kW charging speeds at V2 chargers. We can use the facilities, stretch our legs or take a short walk and maybe even grab a decent bite to eat or a beer and relax for 30 minutes or so.