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.
You don't blind trust them in the fact checking. You check what they point out.
To paraphrase, "if a junior programmer doesn't understand what your code does, it's bad". If Fable doesn't understand, well...