Activities are relevant in the case of graduated members, with exceptions. If a member graduates on the 25th of December but her grad song is on an album release on the following 11th of January that's enough to be eligible in year two. We tend to err on the side of inclusion. Of course you're correct about Haruppi being eligible, I was just clarifying this side point as it was relevant in a prior year.
I just noticed some other mistakes: in AKB Team K, "Icihikawa Manami" should be "Ichikawa Manami" in AKB Team B, "Takita Kayoka" should be "Takita Kayoko"