Yes. The doc hasn't been updated yet so it redirects to a wrong URL
But anyways simply searching "mod menu" on the forum gives a dozen of mod menus to load with the official way
https://forum.plutonium.pw/search?term=mod menu&in=titles&matchWords=all&categories[]=23&sortBy=relevance&sortDirection=desc&showAs=posts
https://plutonium.pw/docs/modding/loading-mods/#t6