Has anyone tried strengthening their esophageal sphincter like in this article?

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9106553/

A pretty recent article on trying to strengthen it with great results. It got published and everything so it's not like just some random guy online, but it is just one guy.

Anyone try this? Have any thoughts about eating with a decline to make your muscles work to strengthen them? Sound plausible?