He didn't nerf em, we know Boa has a hax. And we know Catarina goes after pretty women.
Fact is she's gonna destroy majority of the dudes and women who aren't top tiers. Cause only known way to counter her hax is not be into lust like Luffy or stab yourself to have pain override your senses like Momonga, which results in handicaping yourself.
She is OP.