I'm not reading anything into it. The individual beats of the plot might be different, but the overall plot, Jerry deals with the idea that his girlfriend dated Newman, is similar enough that it would get the new idea thrown out if it was pitched for an episode of the show.
Absolutely you are. The tweet makes no mention of his girlfriend having dated Newman, only that her phone connected to his wifi. Hearing that pitch, I would assume that the drama of the episode would be working out why, not a presumption that they must have dated.
