I can't vouch for the site nor the author, but googling "lowering the mound in baseball" picks up this article in one of the top hits:
https://www.ozy.com/opinion/batter-u...he-mound/87182
The American Sports Medicine Institute, founded by the renowned orthopedic surgeon Dr. James Andrews, conducted a study from 2016–17 that looked at the impact on a pitcher’s arm throwing off a mound 6 inches high instead of the current 10-inch MLB mound. Dr. Glenn Fleisig, the director of research at ASMI, directed the study, which took about 18 months. Fleisig says the study, which also included youth pitchers, is being reviewed by a medical journal. MLB is a sponsor of the study.