Thank you Zoonosis, this is exactly the kind of example I have used to illustrate that the word 'inclusivity' is being misinterpreted to force women to accept men in designated women-only spaces.
The word itself derives as does enclosed from the idea of separating something by making a boundary around it which separates it from everything else.
Inclusivity contains exclusion - anything that does not share the stated characteristics of a set can, indeed must, be excluded.
Otherwise every group would have to potentially include the entire human race in order to be 'inclusive'.
A Pigeon Fanciers' club does not have to admit a falconer with their beloved falcon, because the falcon does not share the stated characteristic of pigeonhood - not to mention not being very pigeon-friendly😬
So 'inclusivity' for the Pigeon Fancier's Club means accepting all Pigeon Fanciers, in accordance with the EA2010.
Excluding non-pigeon-fanciers is not a sin against inclusivity because as you say
There's no world in which groups, clubs or associations need to be accommodating to people who oppose their very existence.
Ditto accommodating men who oppose the existence of women as a distinct biological category and social group in women's groups, clubs or associations.
Like the WI, for instance.
'Inclusivity' implies exclusion of those who are not women, and the SC has defined what 'women' means, and it is not men of any kind.