This is not at all the point made by the author. The finger is being pointed at regulations which prevent increasing the supply in housing driven by NIMBYism. The article points out that the crisis dates back to the 80s - predating not just the current tech explosion but also the dotcom boom. Knowledge workers are not just programmers.
> Other cities with harsher climates have less homeless people because they can't survive the winters homeless, but that's ignored in this article.
The article does not ignore but explicitly addresses your point ("[...] With similar reasoning, we can reject the idea that climate explains varying rates of homelessness. [...]") and brings high rates of homelessness in cities with harsh winter climates: Seattle, NYC, and Boston.
> There is more nuance to homelessness than "tech workers make too much money"
What you wrote has nothing to do with what's actually in the article.
As for the bus issue, most sources I found (eg, https://www.theguardian.com/us-news/ng-interactive/2017/dec/...) show that the flow is _out_ of the big coastal cities when it occurs.
I'm sure there is more nuance, but zoning and the lack of true market forces to build more and denser housing seems to be a very large piece of the puzzle.
Other states bus homeless people to those cities, but that's ignored in this article.
Other cities with harsher climates have less homeless people because they can't survive the winters homeless, but that's ignored in this article.
Any person selling you a "simple obvious answer" to a complex issue is a charlatan pushing an agenda or trying to make money off of you. There is more nuance to homelessness than "tech workers make too much money"