What does 2 Kings 23:22 mean?

No Passover like this had been celebrated since the days of the judges who led Israel, or during all the years of the kings of Israel and Judah. 2 Kings 23:22 - Modern Text Bible

(This Passover is unique—no one had celebrated it this way for generations. Josiah’s reform is a return to something that had been lost for a long time.)