OP isn’t referring to the package manager. They’re talking about Nginx Proxy Manager

Its a meta property in the HTML. Viisible to software, but not shown in the article.

I’m looking into a game manager and the other project I’ve seen that looks this polished is RomM. What are the differences between this and RomM?

Edit: GameVault is a Windows/MS Store app… Guess that makes the choice easy for me