I think the poster is indeed criticizing bulk shopping. I would then to agree that shopping in bulk makes it easier to overprovision or to have things go to waste or being bought superfluously. I am also not sure about it being cheaper in total because my experience with bulk sellers is that they achieve their profit margins by their product mix, so selling you some cheap items as loss leaders or discount items and recouping on others that you buy at the same time. Doing weekly shopping trips at different supermarkets can counteract that by letting you buy more various promotional items.
Of course it comes down to how much personal time you then have to spend on shopping to drive your bill down.
Of course it comes down to how much personal time you then have to spend on shopping to drive your bill down.