Nope. Nobody's been updating it. I always meant to finish filling in the missing stuff and to add new emulators as they emerged, but never quite got to it. There are a few newish emulators in the database (first release circa 2012-3), though.
Any volunteers? It's easy to do - just need an icon, link, brief description, a few dot points listing key features, and optionally also screenshots. If everything is supplied to me, I can put stuff in. Or Niemann (or I, probably) can set you up with the necessary access privileges to do it yourself.
Or another option would be for you guys to make a list of all the emulators missing from the database. I'll then chip away at it every weekend after my holiday until we're up to date.