You're missing the point. This is about them over-billing the customer with the autopay at the exit.
Given how bad stores have gotten about that with regular checkout, I wouldn't be surprised. Superstore/Loblaws has been the worst of it to, where they regularly don't honor their own sale prices - especially for bulk/combo prices - at the till so then you have to take it to the under-staffed service counter and wait in line there. Pretty sure it's 100% intentional and that they'd absolutely so it with an autopay system