her statement is not clear, but because she already knows about King existence she won't say something like that about Lunarians, however if she means Kuma's race, then that means she doesn't know that Kuma belongs to that supposed extinct race which makes more sense
1種は歴史の彼方に消えちまったかも知れねえがお前は生きてる
Google translate says: One species may have disappeared into the distance of history, but you're alive.
Checking the separate words in the dictionary adds: One species may have disappeared into the distance of history and became unknown, but you're alive.
She speaks of only one race that disappeared, and we know King's race is extinct (except for him), so that means she is referring to King's race. The third race is not extict or unknown according to her.
Besides, she wouldn't speak to King about Kuma's race, when she wants to recruit him/put him in her freak museum. She'd talk to King about his own race. This is really very clear from this scenario.