I've lived here for 3 decades. No one here calls it that, and the google hits are (1) fairly few and (2) mostly google treating it as a synonym for "silicon valley" and (3) actual hits are for a not-well-known recent comedy news show.

I certainly did not deserve downvotes for speaking the truth. It's not a thing, it's not widely used, it's a recent one-off joke -- and if you want to make fun of silicon valley (which of course has many faults), "silly" is simply not what this place is like.