Whether Trump meant it or not is irrelevant. Mitch McConnell and Paul Ryan sure as hell meant it.
(Incidentally, I ran some numbers. Four of the current US Supreme Court justices were confirmed by Senators representing less than half the population of the US according to the census used for apportioning the House in the Congress in which the justice in question was confirmed, considering each Senator to represent half of their state's population. The four in question are Justices Thomas, Alito, Gorsuch, and Kavanaugh. If anyone wants numbers I can post them.)