Yeah, because DNA similarity is SO HARD to decipher. You count up the number of DNA differences between human and chimp and human and gorilla and chimp and gorilla and you get a larger number counting between human and gorilla or chimp and gorilla than when counting between a human and chimp. Thus chimps are closer to a human than they are to a gorilla according to DNA.
Hard to make much more sense of it than that!
Not just the count of differences, though. There’s nesting.