You're not the only one: there is no official information about which pools qualify for Airdrop Points. The Splinterlands team itself didn't knew the answer, and I had to keep asking lots of team members on Discord until someone was able to get me the full list.
In the other hand, I do understand their situation: the game is growing much faster than anyone could have predicted, it's normal to let those small quality-of-life stuff at the end of the "to-do list".