The title of this post and the the title of the article are not justified. The author's take-home in the final paragraph is that standing is not exercise, but standing desks may help those with back or neck pain and some people just prefer it. So, really, there's no evidence here to support the "Overrated" claim in the headline.
Like every post I see on standing desks, or anything with a controversial/contentious set of studies/proponents, each writer can select whichever set of studies from the vast array that conforms to their viewpoint. Those studies that disagree with the final conclusion? Better point out potential confounders, non-causal links, selection bias, etc. Drag out the usual methodological suspects to invalidate an opinion you don't agree with. It's easy to straw-man, though it's also easy to go to the discussion and just copy the authors' own assessment of their studys' weaknesses.
This happens all the time in science like epidemiology, you're not an epidemiologist if you haven't made a dozen complaints about an article's methods before considering its ramifications. Even Einstein - despite the evidence to the contrary, he could not accept some of the quantum-mechanical conclusions that his work helped bring about.