That's because the problem is not whether or not he was exact in his quotation. He could have been reading those passages directly from the book and they would have still had a cow.
And the article actually nails the reason why quite well: those passages are inclusionary, and really points out how these Nationalist Christians are distorting that message. They have turned their form of American Christianity into only caring about abortion, guns, and how evil immigrants and trans people are. But the Jesus in that book loves everyone, unconditionally, and calls his followers to love everyone too.
If Jesus were alive today, the Nat-C's would have sent him to CECOT already. (It doesn't help his case that he's a brown-skinned Palestinian Jew....)