You dont think the "immortals" were squeaky clean do you?
Drugs we're around, although not as prominent or accessible, but they we're there.
Alcohol abuse was rife at this time, and all the associated problems were prominent. i.e wife abuse.
The old "what goes on tour stays on tour" motto was in full effect during this time that these "immortals" we're involved in the game. How many women did these "married" men bed? How many drunken brawls erupted? How many motels, pubs and such we're trashed on tours they we're involved in? During the 50s,60s,70s, even 80s these things we're not talked about or reported. It was a code of silence.
What about racism? It was prominent in society and in the game during this supposed "golden era" of rugby league. You cant tell me all those "immortals" were open minded, tolerant men. Sorry, i forgot, we dont like talking about that.
I'm not accusing these men of anything, just stating what was around during the time they played, and you'd be foolish to think all these "immortals" had no skeletons in their closet, that by todays standards would make popping a pill look tame.
Based on what he did on the field, then yes Andrew Johns is an immortal.