He is just getting educated he didnt have a risk man
You can get HIV from exposure to infected body fluids: blood, semen, vaginal fluid or breast milk. If your penis came in contact with vaginal fluid that would put you at risk for HIV, whether you ejaculate or not.
You don't have to have ejaculation to be infected.
It could happen either way it depends on a lot of factors like
the persons Viral Load
Hiv Is a fragile virus all the cards have to be in place to contract it yes it does happen on a one time exposure.
If you are talking about inserting one time and pulling right back out its to low of a risk
Whether the man ejaculates has nothing to do with risk to the man, but a lot to do with the risk to the man's partner. The risk to the man would be from contact with the blood or vaginal secretions of the partner on broken skin on his penis.