For Doubles and Salvage, as soon as you have an opportunity to play any of these playlists after the 2.0.0 patch, you should be able to earn the cards. The flags are not retroactively granted, but your stats from previous playtime in those playlists should still be there.
English
-
Salvage has unlocked for me now, doubles hasnt been an option as of 2.0 so looking foward to finding out :)