You have a certain point, however I think it depends more so on the individual birds than their sex. I haven't observed what you say in my flock.
If it was generalised bullying by more than just one hen, then I would probably do as you suggest and bring him out, because there wouldn't be any...
Personally I think pinless peepers are cruel.
I would separate the pecker not the peckee. Isolating a chicken reduces their standing in the flock and you don't want a moulting rooster being reduced further. An aggressive or otherwise troublesome hen needs to be brought down a peg though...
I would see how she behaves around him after a couple of days.
If there are any red scabs and she pecks them you can use bluekote on them. Have you got better close up pics if the pecked areas?
She may be preening him to loosen the waxy feather shafts on the new feathers. Perhaps a bit too...
Looks like moulting to me. Birds are vulnerable when moulting and sometimes hide away a bit until they get their mojo back.
If the hen has pecked wounds, then she will carry on as the blood and scabs attract her. Good idea to separate her for a while.