Judgemental means predicting where a person goes after death, so you are absolutely correct. It is only God’s place to judge.
However, it is a spiritual work of mercy, stated numerous times in the Bible, to rebuke a sinner. If my brother was mutilating his body through cutting, illegal drugs, and other forms of self-hatred, no, I cannot “judge” that he will go to hell for this, I can, and should however, tell him how he’s damaging his soul and try to get him the help he needs. This is actually a great act of love, because if I didn’t love my brother, I wouldn’t care about his soul.
On the same token, if I am doing something to jeopardize my salvation, I surely hope someone will tell me!
When my children are about to endanger themselves, I am loving and charitable by trying to stop them. If that means I yell “Stop! You’ll get hurt!” Then so be it. But I’m sure as heck not going to watch my loved ones heading for a train wreck and not trying to stop it,