BLM is more concerned with transgender equality than they are with black lives lost in Chicago. They have a lot of concerns they want to address before they even begin to start worrying about the biggest killer of blacks.
I tried to go there now, but it appears to be down.
From secondary sources: "We [BLM] are committed to disrupting the Western-prescribed nuclear family structure..."
I found this image supposedly taken from their site. Note the "queer affirming" talk immediately after the opposition to the nuclear family structure. They want to free themselves from "the tight grip of heteronormative thinking." Like I said, they have a bigger list of things they are concerned about than most on the Left know (because the MSM won't report about it).