Thus is based on one controversial source, an article written by a priest, to which the commission board decided to formally respond with concern, including for conflict of interest

pmc.ncbi.nlm.nih.gov/articles/PMC5567452/

There is a whole discussion.

The point of having sources is not to demonstrate a number is true, but to allow readers to see how scientific are the findings. You can read the discussion for yourself.

This poster cherrypicks a controversial article that shows the numbers the poster authors wanted, despite it being an outlier in that research space