My guess, and it's only a guess, is that the TA is saying that a revalidation wouldn't "take" or wouldn't be seen by 4M. But you'd likely know much better than I would what the TA means.

(I think the TA has been wrong about a couple of things, such as saying that if I fly HKG-JFK-EZE-DFW, that uses up one of my five North American segments, or as the TA put it, if I transit North America to get to South America, I would then be limited to hitting five airports, stops or connections, in North America; I don't see any basis for this in my reading of the rules.)