This is not the study. It is an article talking about the research. It contains a link to the scientific paper (here it is: https://www.pnas.org/doi/full/10.1073/pnas.2120529119 ) which unfortunately is not open access. The abstract is accessible, though (abstracts are short summaries with the most important information about the work).

Edit: this seems to be an earlier pre-print:

https://www.researchgate.net/publication/354631823_Methylphe...