They are technically separate as Moffett Air Field is federal land and not in Mountain View. In practice you can cross a bridge over Stevens Creek and go from one to the other, and they share snacks and bikes so they’re essentially treated as the same campus.

(I have to admit I was very confused how someone might get the acronyms all correct and misattribute the city…then I spotted that you pulled this from Google’s data.)

Also US-PLV is “Playa Vista” FWIW. US-LAX is what you’d expect it to be.