The guy may well have been padding his story.
On the other hand I have a bit of a bias about tire companies myself. I had a bad tire on my trailer (RV). I'm obsessive about tire pressure. It gets checked every day before I take the rig on the road, even if it's just across the campground. I keep it at max pressure because it's a heavy rig but well under the max load of the tires. I also check the tires for excess heat at every stop on the highway, about every 100 to 150 miles of 60 to 63 MPH speed.
We stopped at a park on a rainy day last August. We smelled burning rubber but had no idea from where. The next morning I check tires and find one of the tires with less than 15k miles on it is no longer flat across the tread but it is bulged in the center all the way around. The edge of the tread is wrinkled where it meets the sidewall and there is a spot where they was melted rubber poking out. This is a rear tire. No curbs, major potholes or road problems yet I have a tread separating. It still has 125 PSI the max recommended pressure. I take it to the tire shop after swapping it out and the guy doesn't even let me take it off the truck. He just says that I ran it under inflated and it's not a warranty issue. If I don't like his opinion I can take it up with Goodyear, then he walks away.
These are not cheap tires, about $430 a pop now. They are commercial grade 17.5" H rated trailer tires. Good year had a major problem with their earlier trailer tires a G rated 16" tires a few years back. It seems like these are doing the same thing.