This is bad advice for anything serious that can be subtly wrong. I’ve had Fable being consequentially wrong about what a certain, rather small, code block does in our codebase. Not even on something very complex which wasted a lot of time and effort from the team until we checked the code ourselves. I think these tools are still useful and one should learn to use them but blind trust for anything of importance is misguided IMO.
To paraphrase, "if a junior programmer doesn't understand what your code does, it's bad". If Fable doesn't understand, well...