Because I wanted to ask a human who’s job it is to know, instead of an AI that might make things up and waste all our time.
I don't presume that someone will have an answer I'm looking for. I'm pleased when they do, but often I just get breadcrumbs, and I have to solve the puzzle for myself.
I ask him 4G LTE/5G NR questions all the time. I don't know ahead of time if he'll know the answer, but (1) it'd be a solid bet that he does and (2) it's his responsibility to know it given his role.