Of course it is, also addiction really changes people when they are using. Sucks the life and soul out of them completely.
If he is willing to have a look, there are tons of zoom meetings on at all times of the day and night at the moment, the NA uk website has the links to local meetings. I found it really helped fill the time up, get identification with other people and also offer up a solid way of living so that you never have to use again. The bonus is as they are online he can sit and listen in privacy and see whether it helps