Tutorials on how to use and install the legal side of emulators are allowed, it’s when you encroach on copyright that things become a problem. Piracy is not allowed.
Do not post links to sources of copyrighted materials.
Pictures of your Deck running software never published to PC are questionable. My biggest problem with /r/steamdeck is how it made me feel like I joined a bad faith community by buying the device.
There are a handful of moderators and we discuss as a group before we take action. I am not the only voice, so you may opt to wait for others to comment.