The Xbox 360 RGH (Reset Glitch Hack) community is famous for porting "demakes," homebrew games, and emulating various titles. You might see "Cuphead" listed for Xbox 360 in certain forums due to:
Developers often create small homebrew versions of popular games for older consoles. descargar juego cuphead para xbox 360 rgh internet archive
Many sites use popular keywords like "Cuphead" and "Xbox 360" to drive traffic, even if the file is actually for a different console or is a placeholder. Using the Internet Archive (Archive.org) The Xbox 360 RGH (Reset Glitch Hack) community
To avoid bricking your console or downloading malware, stick to official platforms for this specific title. " homebrew games
Simplified versions of the game designed to run on older hardware.