The statement by the British is laughable. Calling for careful consideration and more evidence before they ensure that women are not disadvantaged by the changes made just highlights that they did no such thing when they decided to make the change in the first place.
No one working in the entertainment industry can be unaware that women are underrepresented at all levels of the music industry (as producers, composers and performers). That there are structural reasons for that underrepresentation. That the Grammys, who abolished the women's category a decade ago, have born out in stark numbers that this has led to women losing out. The statistics are there.
If they had stopped to consider whether pandering to a male artist whining about feeling left out may lead to female artists actually being left out, they wouldn't have been able to justify the change.
But now they need evidence to prove women are disadvantaged. There's an annual study published, a snapshot of the state of women in music in the US, which deep dives into this at every level of the music industry. The numbers are not even close. They could have looked at that, there's at least a decade's worth of annual reports. But no, clearly the British music industry must be superior to the US American one for we do not have such issues...well, there's none so blind as those who will not see.