Susan, I've seen those opinions expressed seriously elsewhere and missed your sarcasm!
GG can't be both a single-sex and single-gender organisation.
The lack of honesty about GG being mixed sex is worrying. It is now impossible for parents to make informed choices for their children.
In Scouts, parents are fully informed about mixed-sex activities and can consent or not as appropriate. In GG, the fact that an activity is mixed sex or led by a male who identifies as a woman is now deliberately withheld from parents.
There are plenty of perfectly valid reasons why parents might not consent to their DD being cared for by a male bodied person. Abuse in the girl's past. Religious or cultural reasons. Dignity and confidence issues to do with puberty. Maybe the girl just wants to be in a female-only environment sometimes.
It's up to GG, but seems a shame for girls to have the option of a single sex organisation removed. Especially when a mixed-sex alternative (Scouts) already exists. All female YPs, including those who identify as transboys, should certainly be allowed to remain in GG if it returns to being single sex.