I don't see how boycotting pride brings anyone back from the dead nor increases the visibility of the violence against transpeople. The average person, isn't going to notice, much less care if trans people aren't in the pride event. This is the equivalent of the Communist Party refusing to go to the polls to vote, who is going to know outside of party members, ultra politicos, or friends/family? It seems to me counter-productive and anti solidarity to boycott pride. No reason you couldn't have a Trans Day of Action march and the pride march.
I say kudos to those who attend both, especially seeing as plenty of cisgender allies were there for the trans day of action march, no reason to get all sectarian.