I think it is all additive as per:
"New Favor rewards have been added where favor rewards had not existed previously, or where a one-time-use item is granted."
So that subsequent TR's actually get you something once you have the items. I'd guess you still get the items each time as well in addition (in case you lose them or more likely since it may not even be in the player record what favor was unlocked previously at these sort of tiers).