A good CS program will touch on FizzBuzzesque questions early on as part of one of the introduction to programming classes, and in later classes do a deep dive

A good CS program will touch on FizzBuzzesque questions early on as part of one of the introduction to programming classes, and in later classes do a deep dive on algorithms and their efficiency in pseudocode or real code. I guess it's possible they didn't practice, but I have a hard time believing that they could get through an undergrad CS program and not be able to quickly remind themselves of some basic code logic beforehand if they don't already code regurarly. Were they actually passionate about CS? Did they have bad professors?