Actually, looking back on that exchange, I think this answer here:
"All that section does is ensure that there is no need to keep defining 'woman' to include 'girl'. If it meant what you would like it to mean it would have been written differently. Where, pray, is mention of biological sex in the Equality Act?"
Is a good enough reason to expand the definition to make crystal clear that, as Karen Monaghan says, means biological sex - because then people like Robin can't use the claims that they're just 'concerned' about removing the "difficulties for particular people". Whereas this comment shows Robin quite enjoys creating difficulties for women by suggesting that language thats clear to most genuine good faith contributors isn't clear. How else can Robin justify coming onto MN & gloating over a legal case Robin isn't involved with & which Robin knows is quite important to a lot of women? Especially when Robin has been told by the women who wrote the EA2010 what the definition means. But Robin says she's wrong.
I wonder why Robin would push that narrative? It's a real puzzler 🤔