Blindly trusting scientific studies is a bad idea https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1182327/
He also claimed that misuse of beta-blockers before surgery in patients who have, or who are considered to be at risk of, cardiovascular disease caused 800000 deaths due to scientific fraud, i was not able to verify that this was the case.
https://www.nhs.uk/news/medication/beta-blocker-surgery-risk/