Palpatine clearly says “the life force of your bond… a dyad in the Force” so it’s not something they were born with, but a connection that grows within them. So it doesn’t contradict Rey being a nobody, if anything it would strengthen that point if a nobody could develop such strong connection in the Force. And I also don’t see Snoke bridging their minds as a contradiction, but rather a step towards such a strong connection developing. Maybe it would help if Kylo said “What Palpatine doesn’t know is we’ve become a dyad in the Force, two that are one”.
100% agree with this, this is my mindset.