The adjectival form immersed is sometimes heard as a synonym for baptized. This usage is ungrammatical. To say they are immersed rather than were immersed sounds like they're all still under water. But we know what he meant. It is most commonly heard as a euphemism for sexual immorality.
Some people are squeamish about saying the word sexual .
In reality, the only reason for disfellowshipping is immorality, in the general sense, but here the speaker is talking about cases of sexual misconduct. The adjective immoral has a judgmental flavor. Persons should be discreet about the context in which they use it. A quality of life possessed originally only by Jehovah himself, later granted also to Jesus and his 144,000 Kingdom corulers upon resurrection to heavenly life. It refers to life that cannot decay or be corrupted, and is imperishable.