The most basic weed-out phone screen questions at FAANG still essentially test for undergraduate CS abilities far above for-loops. Tree traversal, data structures, algorithms, and complexity analysis are several topics suggested in the very preparation guides provided by recruiters at these companies.

A lack of understanding for-loops would either get caught at the resume screener or suggest some blatant fabrications thereof akin to a pianist not knowing where middle C is. We don't even need to use FizzBuzz, our most basic interview questions we use are considerably more difficult and our candidate pipeline is sufficient to support this to boot.