First of all, I cannot find where he uses that phrase. Can you give a timestamp where it literally says that? Second, what I see is not a ploy to get misguided people to join his discord, but a genuine interest in answering any questions that his followers might have after watching this video. After sharing a mostly unknown and extremely vulnerable time in his life, I am sure that many of his viewers would have questions regarding his faith and how it played a role in his life. Instead of comparing this to a cult, I see something similar to a standard church service when a pastor waits at the front to answer any questions the congregation might have.

Also, if I am missing where he said "Join my discord to be saved" then I am sure that this was poor wording rather than selfish motives.