No, that should be right (and you can see it listed under 'BackDoor' if you check https://nul.sh/misc/flashpoint/ ).
Are you using the MacOS beta? It looks like the latest version is from 2019- I wonder if you need to update the games list somehow to include newer games. BackDoor 3 came out in 2020, so that could be why. I tried searching for some newer games through the MacOS beta version and they haven't been showing up for me.
I don't really know how updating the games list would be done though, sorry.