I can't say I entirely understood what was going on here, but here are a few things that stood out:
1. The killer targets queer people, and trans women in particular. He can disguise himself in order to infiltrate the community, but his true face is a riot-cop mask. There might be another, more eldritch face under that one.
2. After 9/11, New York is a night-place full of secrets: a corporate cult, a neon green glow, a threatening moon,…