Ah, but you see, that's completely different! Tesco, after all, is very clearly the seller in those cases, while you can clearly see by these 4723 pages of densely-worded legalese that when an item on Amazon is coming from a third-party seller, it is entirely their responsibility, a fact which is absolutely obvious and every reasonable buyer knows!!!
If Trading Standards raid Tesco and find an illegal product, they take action against Tesco for selling it.