> Many mirrorless cameras only have an LCD screen, so are we saying they don’t have a viewfinder?
Yes. That's what everyone says, manufacturers, retailers, and customers. Take for example this comparison chart on Olympus' website. Note some cameras, with a rear display have no Viewfinder listed where there is none:
https://www.getolympus.com/us/en/pen#products-table-1
They call the rear screen the "monitor." Which seems fine, but I've also read it called the rear display, main display, preview screen, and so on.
> The context wasn’t your pedantic view of what a viewfinder is
If I call an apple an "apple," that isn't a pedantic view, that's the name of the object. If I call a Viewfinder a "Viewfinder" that is no less a pedantic view, and instead the name of thing we're discussing.
In general you obviously misunderstood what the word viewfinder meant, and went off on a rant that didn't make a whole lot of sense as a result. I'd suggest you go try a mirrorless camera with a digital viewfinder and report back when you have the prerequisite knowledge for this topic.