They proved themselves not to be righteous judges. They judged the Lord not to be a righteous Judge . He must not be Lord. The Lord judges righteously . He proclaims the salvation of Zacchaeus that very day because Zacchaeus has shown himself to have the faith of Abraham.
Salvation is by faith.
Our salvation is not based on a lifetime of faith, but rather on the life of faith given by God. The Lord judges the inner man. He does not judge based on external factors. Zacchaeus faith was in the Lord. It was judged righteous.