I have a 1TB MX500 and a much older 240GB M500 and the PoH stats are similarly unrealistic for both. The MX500 has ran close to 24/7 for two months now and reports 328h which is like 14 days. The M500 reports 12k hours (~1.35 years) but it's 5+ years old and I'm sure it should be higher.

OTOH the number of power cycles they report seem to be too high, at 45 and 2332 respectively. Maybe that's related?