This seems like a poorly executed analysis of very interesting underlying data.

With this degree of average age variability they can't compare failure rates.

They should show us Kaplan-Meier (survival) curves not failure in this quarter.

Unless they set some datacenter on fire, not much in Q2 should be different vs Q1 for the same hard drive other than it being older.

Sure, internally, I'd do a better analysis controlled for age that shows if there are common failure rate increases but here they focus on model failure rates which is completely confounded by age differences.