Ok, to do this all from scratch, I just installed Battlefield 6 (so NO way I would have it previously). I dragged the single shortcut created from the desktop over to launchbox, went through the usual, and got to the end. It says 0 games to install. Instead of hitting back and trying the duplicate option, I hit cancel and went to search for a duplicate. There is now an entry for Battlefield 6 as a Nintendo Switch game. So that is being created during the process of adding it even though it says 0 at the end. I am sure I can go back and force duplicates and it will go into launchbox. I am guessing Launchbox is maybe importing any game I install on windows as a nintendo switch game??? before I get to that add process in launchbox.
So new strategy, I just made sure the option to auto-import roms was turned off (it was previously on, and I don't recall going in and turning that on, but I remember reading about the option). Another game not installed before. Checking Launchbox first - No Hollow Knight. Installed Hollow Knight, checked Launchbox, no Hollow Knight. Dragged the shortcut over to Launchbox. It added Hollow Knight just fine.
Moral of the story, I think the launchbox update turned on the auto import and it was importing my windows games as nitnendo switch roms???? so user error, if you want to call it that. but i don't think launchbox should be recognizing *.exe files as ROMs for emulation? Anyways, thank you for setting my head down this path to finding the problem. Maybe more of a bug in the auto import. Make sure auto import is turned off. I think that is a solution.
Side note, I went and checked my Nintendo Switch under consoles, and it looks like anything installed since that update is a Nintendo Switch ROM, since I have Star Wars Squadrons, Bloody Zombies (COD modern warfare zombies), and the very interesting one, PrismVR dekstop, which is the software for my Puppis S1 router for use with my Quest 3. That is about the extent of things I had installed recently. So not only pulling windows games, but also productivity software.