It's not based around skill, it's a factor, that doesn't mean it's skill-based, it means it's a factor. All matchmaking settings factor in skill, but that doesn't make all matchmaking settings skill-based. Every time there's someone on your team who gets a 0.3kd, you can assume that their skill was not the deciding factor in the decision to pair them with you. They were used to bring your win ratio down to 50%.