Yes, these are specific to the AR series dies. I'm still confused about the seating procedures and can't find a decent video for that specific die related to the back of the instructions.
It still appears that the vent hole is covered by the locking ring.
seating is normally pretty straight forward. I dont know about your particular dies, so dyodd.
Put the bullet head into the top of the case, then into your press, which should have the seater die in it already.
back the screw in part of the seater die way out.
Run the press so the bullet is all the way up (but not touching the seater in the die). If you're hitting resistance from the seater, you need to back it out more.
Screw the seater down until it touches the top of the bullet.
Lower the bullet in the press.
Gradually screw the seater downwards in the die until you reach the right total bullet length (refer to your manual for the correct oal). You can keep testing the bullet for corerct seating by running the ram every time you adjust the die.
Once you reach the right length, you're good to go! And by not messing with the seater, you shouldn't have to deal with readjusting the die for future reloads on the assumption you stick with the same bullet heads. Using different type of bullet heads may mean you'll have to readjust the die.