darniil: I finally figured out how to fix this in GoG Galaxy. It's oddly a simple fix, but I didn't see anyone online mentioning it when I searched.
Click the settings button to the right of the Play button in Galaxy, mouse over Manage Installation, then click Configure.
Click the Features tab, and check the checkbox for Custom Executables / Arguments (if it's not already checked).
Click Add Another Executable / Arguments and select your Cyberpunk2077.exe file, wherever you've chosen to install the game. Select the radio button for Default Executable, too, then click OK.
Your Play button will now properly launch the game rather than the RED Launcher.
Yeah I use Heroic Launcher on Arch Linux and went to the game settings> Advanced tab and "select an alternative EXE to run" and it runs fine now.