It is fine to be sceptical, but I think you should have taken a few minutes to read the method chapter in the study, seeing as that possibly could have eased your doubts. The first sentence cites the previously published design of the study. In the method chapter it is reported to be an "international, double-blind, randomized, placebo-controlled trial" with 3533 participants and a mean median follow-up of 3.4 years[0]. The cited article on the study of the trial states that "Participants were enrolled from 418 trial locations across 28 countries." [1]

[0]: https://www.nejm.org/doi/full/10.1056/NEJMoa2403347#sec-1

[1]: https://pubmed.ncbi.nlm.nih.gov/36651820/