Programmers are not artists and have no "creative block". What is he talking about?
True. Mostly.
and have no "creative block".
False (with a possible exception for mindless code monkeys, if such actually exist). It's not hard to get stuck on a wrong approach to a problem, or to know you're doing something wrong but not quite why it's wrong, or to have your mind go blank when you're trying to solve something.
So call it what you will. But it happens.