In regards to your observation, Husten’s review notes that the study [1] included subjects where the incidence and prevalence of atrial fibrillation (AF) is low [2], and given the study’s design flaws, its findings turned out to be largely irrelevant except as a marketing tool with relatively negligible costs for Apple [3].
I don’t know if Mr. Husten is an Apple hater, but it would be more interesting if you challenged his actual arguments including those in the study’s accompanying opinion piece: “The uncomfortable fact is that our personal health data have considerable financial value to those who want to use them in the myriad marketplaces connected to our $3.7 trillion health economy.” [4]
[1] https://www.nejm.org/doi/full/10.1056/NEJMoa1901183
[2] https://www.ajconline.org/article/S0002-91491301288-5/fullte...
[3] http://www.cardiobrief.org/2019/11/13/what-can-we-learn-from...