Hmmm. Nicodumus may be right, since there is no evidence in Scripture that he was ever born again of the Spirit.
Possibly, Nicodemus has been elevated to Sainthood by the RCC without ever having been saved from his sins.
I think the only evidence we might have, is that Nicodemus asked the others if the law condemned someone before they heard him, and I believe he was with Joseph of Arimathea after the death of Jesus. I suppose those might be good signs, but other than that, we don't know. I would like to think that later, the rich young ruler came to his senses, but again, we simply don't know. But then again, I don't think the Bible was written to give us a blow by blow description of everything that happened, but was written to point us to faith in Christ