It’s a reference to Paul, from the Bible (https://en.wikipedia.org/wiki/Paul_the_Apostle#Names). He was known as Saul when he was Jewish, and then later went by Paul after he converted to Christianity. The phrase “Saul to Paul” is often used to refer to someone who converted to Christianity, as opposed to being born a Christian. But it is also sometimes used more generally to mean something that turned around or improved. Like, if you want to say “glow up” but you also want to make it clear that you think Christians are better than Jews.
Ironically, the person who said it was Mormon, and most Christians do not consider Mormons to count as Christian.
Honestly, this is something that I hadn’t actually considered before. I’m almost embarrassed, since I like to think of myself as someone who is always thinking about how my data can be misused, haha.
It’s not just about data that can currently be used unethically; there’s also the fact that someone may figure out a way in the future to use today’s data unethically. This is definitely true with something like your DNA, which is so complex that there are infinite things to learn from it. But it can be true of more simple things, too. There’s no way to predict what someone will be able to extrapolate from seemingly harmless information today.