The thread you linked in your first post has a solution that’s basically saying the same thing as I am.
Roblox isn’t going to remove the music you have permission to use, “flagged by our moderation team” means the IP owner contacted Roblox, which as I said is not going to happen if you have permission. Also I’ll mention that post from 2018 was about clearing the music catalogue to begin giving out copyright strikes on a clean slate, not how music uploading is handled going forwards.