When he said “it’s all good,” he didn’t really mean that everything is great. What he really meant was that the there was some bad stuff that he would rather not talk about, like, “Yea, my job is tough, but it’s all good.” Or, “When I go to Europe I’ll miss my family, but it’s all good.”
Maybe he didn’t like talking about his emotions or seeming weak for complaining. Or he just wanted us to think that everything really was great for him.
But maybe, just maybe, he had it all figured out, having realized that none of it is either good or bad, so you might as well call it all good.