That’s a 2021 article, pretty sure Sunshine wasn’t widely used back then, only NVIDIA Gamestream

Use sunshine+moonlight, it has HDR support. Not sure on SteamDeck but I’ve used HDR on my phone with that setup

Powertools plugin is sort of broken I think, my deck stops charging on the charge limit I set even if the Deck is off. Uninstalled it for now and remedied the charging by going to battery storage mode.