The LGB Alliance are in the middle of a court case with Mermaids. It's inappropriate for them to comment.
Tbh even if they weren't, if they want to be seen as pro lgb rather than anti trans it would be preferable to just get on doing their own thing and ignore the drama at Mermaids as it doesn't necessarily play well for them in pr.
I think the phrase 'never interrupt your enemy when they are making a mistake' isn't quite right for the situation but I think the sentiment is close enough.
Let Mermaids get the attention they deserve without dragging your own name into the cluster fuck.