It's about a book review.
And it seems from that review, it's a book which includes quite a lot of 'critique' of Mumsnet users, so surely it's only fair we can comment on it?
Sounds like GL is quite eaten up with envy of real breasts which can produce warm, sweet, nourishing milk. No coldness or sourness about them, or us.
Whereas afaik women are only envious of dicks during long walks without deep cover.