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Your analogy is incomplete. As the potato peeler is putting the peeled potatos into the peeled basket, someone else is taking them out and cutting them in half, and putting the halfs in a different basket. They're working at a different rate than the potato peeler. Another worker is taking the halves, and cutting them in half, and putting those into another basket, at still a different rate. This continues on through several more workers.

The analogy covers the analysis of one uranium sample. There are actually millions more of these systems of potato peelers and cutters, all working simultaneously on differernt batches of potatos. And no matter how many of them you check, they all figure out the same. All the baskets have the same ratios of peeled potatos vs parts of potatos by each different worker.

It is possible that one uranium sample would be contaminated and be "preloaded" with just the right amount of different radioisotopes of decaying uranium to indicate a false age based on radiometric dating. One potato peeler equals one uranium sample. You're theory is that all of the uranium samples are contaminated in excactly the same way, with exactly the same set of radio isotopes in exactly the right proportions to present an false representation of how long that decay process has been going on.

Did you not know this, or did you know but decide that's not something that should be included in the analogy?