Is that something to be celebrated?
I think the fact that a company has had the nouse to differentiate between sex and gender and interpret the Equality Act correctly for once, and has had the guts to say so publicly (especially in such a coherent way) is something to celebrate.
Obviously, the GRC issue is still a major issue and I agree that it doesn't mean there will be no transwomen in the changing rooms at Center Parcs, but if companies are going to interpret the law however they like, it doesn't really matter what the law says.
In recent years, the fact that businesses are frequently interpreting the Equality Act's references to 'sex' to mean 'gender' has been very scary. So the fact that a big company has publicly said what we've all been saying, unheard, for ages - basically 'no, hang on a minute..sex and gender aren't the same thing' is huge and definitely worthy of celebration.