Thanks, @meyer and @raoul .
I discovered the bad news a few hours after I posted my question.
My Apple silicon MacBook Pro still won't find VLC.
It used to! Everything was fine until a week or two before Christmas. Sunday morning service on 11 December is when everything went haywire for me. Given that everything was working properly on this Mac on the previous Sunday, something must have been changed during the week between the two Sundays, 4 and 11 December.
When you look at any change logs, you'll need to remember that I'm in your future! So, I'd suggest looking at the Friday prior, 2 December and going through to Saturday 10 December for changes made which have caused OpenLP to stop finding VLC.
I'm just trying to narrow the possible time period of when things worked as they should and when they stopped working. And then convert that from Australian time to American time.