alt Hacker NewsI can think of a lot of confounding factors for that. Are they just looking at standing desks, or also at the numerous blue collar and service industry jobs that demand long hours of standing at machines and registers? If it's just the former, then there's the question of what kind of people choose standing desks over sitting desks. Is it people worried about their health but don't take the time to exercise outside of work and think standing will be enough? If the latter applies, then there's facts about the stresses and complications of being less financially secure, such as less access to healthcare, longer working hours, poorer diets.
Certainly but correlations not working make it unlikely that sitting is a dominant factor in current health problems. Looking at the details described it makes sense that sitting is a form of idleness and idleness is possible in a standing job. Therefore idleness could more reasonably be the dominant factor with other correlations then contributing more for idle standers than idle sitters, etc.