"How It's Made" is often interesting to watch, but the narration is often rubbish. The script sounds like it was originally written in French (the show is made in Canada) and then clumsily translated into English by someone who hasn't watched the film and doesn't understand engineering anyway.
I once watched a documentary on aquatic ecology that was narrated by Susan Rae (R4 newsreaders with very distinctive voice).
I'm sure she knows that the expression is 'organic matter' not 'organic matters' but I suppose they are paid to read a script and told NOT to make any changes. It was very grating as the expression came up again and again.
Even Fred Dibnah showed a glaring lack of engineering knowledge on some of his documentaries……But it can crop up in all sorts of areas. We have had club members and even outside speakers give talks where it seemed they had big gaps in their understanding or even knowledge of their profession. Went to a talk at the Midlands show last month where the professional knew less about his craft than I do.
However I have seen this at work. The best electronics designers used to be amateur radio guys not graduates though now neither know how a superhet works let alone design one.