That tire was driven on flat. Period. No other explanation. If you pull the tire off the rim I can guarantee the tire is filled with what looks like black sawdust from the inside of the sidewall failing.
cooper rs3-a on my mazda5 developed bumps (zig-zag); the noise was like wheel bearing failure.
It also triggered the TPMS in winter. (20-27 psi findings)
My always verified cooper cs5 on my yaris developed cracks in the blocks at around 3 years old (3.5 from production date) and 8/32 depth.
A pressure gage stored in each car could also help.
Yes, it's probably been run under-inflated. But it's also a Hankook. The Koreans do many things well, but my experience with their iPike snow tires/Nokian knock-offs lead me to conclude that tires are not one of them.