I think there is something to what you say, but the "halo" isn't his problem. He should write as he pleases.

He doesn't have to be an expert in what he writes. I mean from his own perspective (I assume, never met him, don't know him) he is just a regular person writing a regular article about something he found interesting.

It is entirely the reader's problem if they put this extra pressure on his "implied wisdom and halo".