Endor Escalation achievement

while we're on the subject of achievements for events, I'm a little confused by the defense of dathomir one. It says complete tier 1 ten times, but anyone who can complete tier 2 will just do that, as you're allowed to do the same tier twice, so I won't complete this achievement for 2+ years when I've finally farmed both of them all the way and can waste some refreshes on tier 1? Is that intentended? Or should both tiers fulfill the requirement?

https://imgur.com/a/7vIG2