Whatever is being done behind the scenes is being done by people who live in a behind-the-scenes world. I'd be surprised and a little skeptical if we hear substantive public statements about KS from anyone from the legitimate mental health or substance use treatment worlds. The NBA has programs for players and former players, and I'm sure they have been busily making decisions about how best to help. They may have looked at all the evidence and decided that there's nothing they can do beyond offering to help and referring him to a hospital, which probably has more clout than a former employer.
I haven't kept up with KS's public statements, so I'll add that none of us really knows what's going on, and he may be doing much better than what might appear on his downloads.
Having said that, there are limits about what can be done against someone's will. "Danger to self or others" is the clearest trigger for involuntary intervention. "Inability to care for self" can also be a trigger (depends on the state), but that one is a little fuzzier than suicidality/homicidality-- though there's also a lot of room for gray with the dangerousness criteria. Some psychiatric diagnoses lend themselves to ambiguity, partly because they tend to be more dramatic/public and partly because a lack of insight is often a fundamental part of the illness. And if the person isn't coming in for help, it's very difficult to do the sort of evaluation that allows for an involuntary intervention.
Someone with mental health or substance use issues who also has financial resources (+/- fame) can get lots of help, but they may have the flexibility/clout to avoid the evaluation, the fame that allows them to dig the sort of hole that can be difficult to climb out of, and a cluster of "friends" who feed off the celebrity/money and reduce the likelihood of serious intervention. Just look at all the celebrities whose lives were cut short at least partly because they didn't live in a world of consequences; of course, there is a much larger world of people without privilege whose lives were permanently derailed by mental illness and substances.
I've lived in the mental health world since KS was born, and I'd add that "permanently derailed" can only be decided in retrospect. I've seen many, many people who look pretty messed up and return to being thoughtful, creative, productive people who find a lot of happiness. It's difficult to predict (and understand) when you are in the room with someone, and simply impossible to know much from a great distance.