No, you use the konami code there, this is the new one from the pencil cutscene
There's a new one, we just don't know where to use it, it's:
up up up down down enter
The one in the itch io link you got e-mailed, it's a new exe, and I have no idea what to make of it.
Click the lamp post if you haven't already.
And don't forget about up up up down down enter
Edit: I also got that response, it's most likely automated.
Go to the Multiplayer Fix log and e-mail the yahoo address.