The result of laws like this is not that the store will never buy too much, it’s that when they do buy too much they will give it away to somewhere it can be used instead of destroying it. It will not cost them much if any more to simply give things to food banks or charity shops.
It's not so easy to give things away at scale. If someone deposited 500 kilograms of assorted meat products outside your front door right now, with a note attached saying they need to be consumed or frozen in the next 24 hours or they'll go bad, how much work would it take for you to deal with that?
Clothing is of course a bit easier to deal with (it'll still grow mildew if you don't protect it from moisture!), but the source link explicitly anticipates there will be some circumstances where it's impossible to give away clothing and authorizes destruction in that case.
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