I think the problem is with hollowpoints.
I know several people that did similar with cheap post ban 10 round 9mm Glock mags, but the lion's share of the use was with round FMJ or maybe some truncated cone. Someone with better search skills can probably turn up the post with DocGKR and others noting that what institutional users were experiencing was issues with JHPs. And even that, IIRC, was over large round counts. So low volume testing of expensive JHPs might not reproduce the same results.