So isn't that article showing the "old way", which God commanded, was to kill those who did those things? If that change, then that's fine but I'm trying to first understand if that's the foundation or not?
I read Christian theology, not pre-Christ Jewish theology. I'm never going to spend my time analyzing or judging the mind of God, or trying to follow God from some other people's perspective. None of us have ever been a member of the Nation of Israel before the time of Jesus Christ, and I honestly can't tell you what it was like to be them or how they should have interpreted God's teachings. It's possible that a great number of them interpreted God's teachings to them very differently than you interpret them. The quotes from that article about what 1st-century and 2nd-century Jews believed already show that even in the Jewish faith outside of Christ, they didn't appear to interpret those passages the way you would have us interpret them.
Jesus makes the responsibilities of his followers very clear. He certainly commands you to act in a manner that is different than the literal wording of the Old Testament. Does that mean that the Old Testament was wrong, or just that it was being interpreted wrong, or that it was interpreted right for its own time but that time had passed? That's not my job to judge. My job is to follow Jesus.