FWIW, I have been around for a long time. As TPM mentioned what was standard procedure years ago has changed in many areas. So much so that it is hard to take anything as the gospel. Unless we all of a sudden stop learning it is reasonable to expect things will be changing again in the future.
So right or wrong, I suppose we are left with where we are at the current time. But 20 years from now what is right today could turn out to be wrong. What is wrong today could turn out to be right. There are many examples that lead me to that conclusion.
One more thing to think about. All great pitching coaches, all great hitting coaches, do not agree on everything.
We have a knowledgable crowd that participates in these discussions. I have actually read some of the things that BaseballInstructor50 has written about pitching other than the running issue. Some really good stuff that can only come from experience. IMO.
That said, if his intent is to increase traffic to his website, he should talk to Julie. If his intent is simply to help we should welcome him. Doesn't matter if he is right or wrong about something, we can all learn from each other. One of the best hitting coaches that ever lived has been supposedly proven wrong about certain things. Probably can't ever change his mind, but sure would be interesting to hear him talk about hitting.