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If nobody was talking about Christie, it's because 95% of what he did only impacted NJ. This is a spillover, because it happens to be related to a megacity doing something for the first time in North America.
But, beyond that, when people start running for president, people start talking about them. Criticisms or not. No one talked about Joe Biden doing anything from the start of the 2016 election until he announced in 2020, in spite of having been a major political player for decades.
[1]: https://en.wikipedia.org/wiki/Fort_Lee_lane_closure_scandal
I've been hearing about Christie for absolute ages, no clue at all what you're on about.