Respectfully, I don't see much difference. His change of the word upstairs for example is slight, but if you were use to hearing it only one way for all of your life, and then heard it as an adjective, it might seem jarring at first. These are not parallel examples, I know. I think making because a preposition is a fairly seamless move. It reminds me of the French word chez (as I understand it). I could say "at Fatburger" : "chez Fatburger", but I could also say "at the doctor's" : also just "chez médecin". It cuts off the le because it's completely unnecessary. Someone can correct me if I got that wrong, but perhaps the intent is still there.
It's seamless, yeah -- since it's not a huge deal. The problem is that a lot of internet speak is horrible and you can never tell quite what's gonna catch on. Good example there with chez though. I was thinking about this earlier and thought of a truly awful one but I seem to have forgotten it.