This seems to imply that “tech expert” is someone all-knowing regarding tech. In my mind “tech expert” is about literacy. You may not know the specifics of all technologies but you have the mental toolkit for understanding them conceptually. But it is also about context. If you are the person who people ask for help with tech stuff, well, then you’re an expert, at least in their minds.
An expert in any field must also be well connected so they know who to call / ask / refer to when they don’t know how to proceed.