As long as you're on windows you'll be fine. the issues with steam deck setting off battleye is when people try and use D2 through SteamOS/Proton Edit: here is the article about it [quote]Steam Deck and Destiny 2 Destiny 2 is not supported for play on the Steam Deck or on any system utilizing Steam Play's Proton unless Windows is installed and running. Players who attempt to launch Destiny 2 on the Steam Deck through SteamOS or Proton will be unable to enter the game and will be returned to their game library after a short time. Players who are not accessing Destiny 2 through Windows and attempt to bypass the SteamOS/Proton incompatibility will be met with a game ban.[/quote] https://help.bungie.net/hc/en-us/articles/360049024592-Destiny-2-Steam-Guide