Of course redemption is possible - but does that make one suitable to preach?
I realize Paul seems to be a glaring hole in that argument but they also gave qualities for those put in teaching positions - like solid family men who kept their own household in line.
Being allowed into Heaven and being a teacher of the Word and being held as an example are different things.
Paul persecuted and killed Christian’s. I don’t know this man and neither do you. The pastor says his life has been transformed. That’s not for me to decide. The pastor is aware of his background. Considering what some do who are “wholly santified” I’ll take the pastors word for it