I haven't found it to be even remotely true for the food my family is inclined to eat. Every time I've gone to visit hip small college towns for the last 5 years, I've eagerly sought out the talked-about eateries, and they were all... distinctly mediocre compared to NYC or Bay Area or LA food.
You still can't find anything but Americanized Asian food, even the California-cuisine upscale places are decidedly mediocre, and the food trucks are... fine.
Certainly, it's better than it was at the margin, but it really depends on what your baseline is.