Well, no - The particular group of feminists in question would not be made happy. Why would they be? They’re not campaigning to stop hentai from reaching the US. They’re upset about the games being sold in Japan because they believe that it contributes to sexual violence in Japan.
(When told that the rates of sexual violence in Japan are quite low, they insisted that Japanese culture shames victims so much that they dare not report. Which is probably true to an extent, but rape victims have trouble coming forward everywhere.)
That particular group is interested in international issues and is campaigning against various things in lots of different countries. They’re not only interested in their own backyard. And they can’t “charge” people with anything, they’re not a government agency and have no actual power beyond their disapproval. They’d be happy in the sense that they’d see they’d accomplished something, but if the games were still on sale in Japan, they’d want to keep badgering the Japanese - and now with the justification of thinking they’re winning.
Whether or not law enforcement would be ‘pleased’ by a ban on hentai exports is not something I can speak for, I don’t know enough about the inner workings of the agencies involved. I suspect that various child porn task forces would be pleased if all loli exports were illegal because it would make it easier for them to charge people and then search their houses/computers for real pictures. But I don’t know that.