Sure they throw faster. But fewer innings. I am sure that is some factor but the doctors seem to say it is from too much pitching at a young age. A kid at 18 now has probably thrown ten times as much as a similar kid back in the 1960s.
I will keep listening to Dr Andrews rather than dudes who maybe stayed at a Holiday Inn.
https://www.cbsnews.com/newyork/news/mlb-pitching-injuries/