I don't think as a concept this bothers me. There are other "writers" who are actually not only the other sex, but are really more than one person, so that is not so odd.
I also don't think it's always true that female writers write as men to be taken seriously in quite the same way that was true in the past. I don't think JKR's Strike series is really a good example of that, it was hardly even a secret who the real writer was and if anything she was trying to get away from being a writer for kids rather than a woman writer.
There are lots of women writers now and the goal more of a name change often seems to be to appeal to genre readers who are often very heavily weighted in one direction or another. The romance "life stories" genre is read almost exclusively by women, cowboy stories which are basically the same are read almost exclusively by men mysteries are divided by cozy (women) hard-boiled or spy thriller types (mainly male) and some, like the Strike novels, that appeal to both. In fact in t
In the very weighted genres I think authors would see an advantage in writing under a name associated with the sex that tends to read them, and in fact both romance and westerns seem to have as many fake names as real ones for their authors, and some write under more than one name.
Creating a persona is a little unusual, but maybe it just seemed like a neat idea. I think it's right that they shouldn't get an award intended for women writers but I don't imagine they anticipated that possibility. Being on a list of women writers is a little odd but I'm not sure that is so big a deal in itself.