The study referenced in the Nature article analyses human faecal samples, and classifies them into one of four groups called enterotypes, depending on the abundance of particular microbial species. These groupings are termed Bacteroides 1 (Bact1), Bacteroides 2 (Bact2), Ruminococcaceae (Rum) and Prevotella (Prev). Bacteroides 2 are associated with inflammation, and more Bacteroides bacteria than Faecalibacterium microbes.
The authors unexpectedly discovered that there were significantly fewer of the Bact2 enterotype than expected in obese individuals who were taking cholesterol-lowering drugs called statins. The authors found a connection between these gut microbes and the statin drugs, but further research is needed to determine the nature of that connection. According to the article, "molecules such as trimethylamine oxide, which are made by gut bacteria, might accelerate atherosclerosis, and their presence is associated with adverse cardiovascular outcomes, including death."
And study in the European Union called the MetaCardis project (http://www.metacardis.net) including nearly 900 participants whose data they analysed, also found a higher prevalence of the Bact2 enterotype with a higher body-mass index and obesity.
See article, https://www.nature.com/articles/d41586-020-01281-0 .