Taking his entire statement into proper context, it's pretty clear he was being sarcastic and saying let's wait and let facts come out before we jump to conclusions. Unfortunately after tragic events like this, people across the political spectrum often latch on to isolated facets and twist them around to use against their political enemies, and all the different current accusations that he's right or left or trans are pretty much specious at this point.
Heck, even the article itself is an example of this, because it's trying to imply a different meaning that what he actually meant. I honestly don't think he actually meant to blame this on trans people, just pointing out the main stream media is pretty good about harping every potential right wing indicator while burying the left ones after things like this.
There are good reasons to be wary of his attitude toward LGBT people, but I don't think this is one of them.