the issue I think is when he is at home and it is sitting in the driveway, if you look at what will said it was more that normally cycling between 0ish and 100% isn't an issue as the batteries will most likely age out before you run out of cycles.
the issue is holding them at 100% for long periods, think storage, is bad and will reduce cycle life even more than the operating range. although not as bad as leaving it sit at 0% for long periods and this is a easily preventable issue by just dropping the voltage while it is in the driveway or shutting the battery off at a reduced charge if you don't need to run a battery at home.