As a long-time suicide "window shopper," I don't know how to feel about these developments.
I think it's a shame that a young person felt so awful for so long, regardless of what treatment options were or were not explored. I assume efforts to treat were comprehensive, or the 1.5 year vetting process would have yielded a different result. That is, again, only an assumption.
With that said, I cannot speak for Belgium, but my experiences with mental health care providers in the United States have been more miss than hit over the past 20+ years (from my late teens on). It's hard, really hard sometimes, to find a good psychiatrist. Even harder to find a good therapist. Lots of trial and error for a mentally ill person to work through, potentially expensive, plus the long lead time before feeling better.
As miserable as life can be for the depressed (it's pretty fucking bad), I don't know if 1.5 years is long enough to figure anything out. It's also harder, I think, to identify conditions that are treatable as opposed to intractable when dealing with mental illness. I'm pretty sure there have been multiple 1.5 year periods where I would have seemed hopeless.
I did get better, but it took 22 years of mostly misery. I suppose that's a lot to ask of anyone. I also believe it wouldn't have taken so long if I could have found more consistent quality of care over the years. It's so easy to waste time doing shit that ultimately doesn't help at all. It's insane the amount of time, years, I've wasted on this.
I guess I don't have a problem with the concept, but I fear the science isn't in a place where these assessments can be made reliably. I base this only on personal anecdotes over two decades, as I am not a scientist.