Running that wanted to remove steam for me 
I marked steam as explicitly installed using:
sudo pacman -D --asexplicit steam
Then removed steam-native-runtime :
sudo pacman -R steam-native-runtime
then cleaned up unused packages with:
cleanup
Updated with:
garuda-update
and rebooted.
Just a reminder to favorite (also pin and whatever) the regular Steam program, since the Steam Native one will be gone.