In an edit like this, the implication is that when the Force created this life on Palpatine’s behalf it was placed in a random woman across the galaxy. In Anakin’s case, he got lucky with a loving mother. But with Rey, we get to see what happens with the opposite; an abusive mother and step-father.

As for why Palpatine cannot extract Rey’s location from their minds, it’s literally because they cannot remember even selling her in the first place because of how drunk they were at the time and continue to be. I’d be willing to experiment with alternative wording for this. But we should probably keep “Weak, like your parents” and simply remove Rey’s response to this comment as what he’s stating is a compelling argument for why Rey should kill him instead of being an insult.