Asking about above the hood stuff is something someone can just rehearse. asking "how does ngFor work.

or how does angular only render changed data (the real answer, not "change detection".

understanding what is a service equivalent in native js.

questions like these is what show me someone "really knows" angular.

knowing the answer to the questions you asked will give me confidence in saying "they can write code"

but if the candidate answeres questions like the ones I showed before i can say "they can fix problems"