The linked article makes no claims about health outcomes - instead, the participants in that study reported feeling better, which contributes to the reported improvement in health-adjusted life years.

In fact, there was no difference in BMI reported between the standard condition and the intervention designed to decrease sitting time.

I don't know this literature much, but a separate analysis of the same study may show improved cardiometabolic risk profiles in workers who are encouraged to stand more often[1].

1. https://insights.ovid.com/crossref?an=00005768-201803000-000...