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I have submitted a game to see how it works. I submitted it about a week ago and haven't heard anything.
The submission queue at the moment is completely empty. Your submission was either approved and added or we didn't receive it. When a submission is rejected, you get a PM in response so that sounds unlikely. Try submitting through the form again. I'd recommend submitting through PC rather than mobile because connection issues arise more often via mobile. Also, there's an option via the "Submit" page at the top that says "View My Pending Submissions". That will display any pending items.
I am currently rechecking my PS2 games and have found several games not on the database lists. It seem the Wii is missing a bunch too.
We are still getting missing titles for those consoles, surprisingly. Mostly because of the sheer size of the libraries. Checking master lists can be really time consuming, so we're just letting the few left out games trickle in.
Thanks for the submissions. If you have pending submissions in the future that seem stuck for a long time, there's a thread in the Feedback Forum for questions/leaving extra info.