Not at all. Transwomen face abuse constantly, both for being women and for being trans. The people behind that leaflet have one intention, and that is to incite fear of and hatred towards trans-people, that's one of the reasons the leaflet is so dishonest. If it goes unchallenged (and I'm not saying I entirely agree with how that happened) then how do you think a transwoman, new to anarchism, might feel about the movement if she went to the loo and saw them stuck up everywhere? Do we really want to allow non-anarchists to make anachists feel unsafe or unwelcome at our events?
I don't agree with much of the open letter (either the contents or as a tactic) and am sad the bookfair is no more, but I find the apologism, or undermining of the damage that could be done to people by this leaflet and the group behind it pretty depressing.