I saw the interview with the Turtle saying essentially: “We’ll cross that bridge when and if it appears. I won’t commit now, especially to YOU!”
I don’t doubt that is what impression you were left with but what he was talking about is his acceptance of a 2020 nominee for the court. The tradition is that the President at the close of his term in an election year doesn’t have his nominee advanced by the opposing party if it is in control of the Senate. Biden mouthed about this a few years back but his attempt to claim a precedent failed to address the qualification that the party of the President is out of control when such a nomination is held without action.