I read it a while ago. While my initial reaction was "relatable", later I started getting doubts. Is it that talented people are more prone to depression (e.g. due to social isolation) or that their depression channels into existential/philosophical more often (this sounds even more plausible)? In both cases, I would love to see some numbers.
The only thing I know that might support a link thinker-depressed is this one: "A Wandering Mind Is an Unhappy Mind" (https://science.sciencemag.org/content/330/6006/932, PDF http://www.uvm.edu/pdodds/files/papers/others/everything/kil..., HN thread https://news.ycombinator.com/item?id=16797947)
As a side note, "talented/gifted" is usually considered synonymous with high intelligence. Yet, I bet that it is as strongly correlated with dedication (going to the levels of passion or obsession) and sensitivity. It might happen that it is not IQ that matters in terms of gifted people being depressed.