Er, could you possibly explain the issue a bit more? I have no idea what you mean...

It looks like he's stating there's somewhere in the campaign where it says it's extended (goes further) by accounting for an SE profile.

Yet I have no idea if that is or ever was a feature.

I don't think that's a thing. You should be able to play through the whole campaign without ever having to register anywhere (though if you wanna register for Stick Empires that's cool too :) )