Again, not true.
While rare, stats do change over time.
Some 20 years ago, I was listening to a White Sox-Orioles game during my commute. Before the game, there was a ceremony where former Oriole great Jim Gentile was awarded $5000 because he had a clause in his contract in 1961 that he would receive that money if he won the RBI title.
Some 40 years later, the found some long-hidden RBI and it tied him with Maris for the crown.
So maybe it was etched in limestone?