I only saw this thread today. I was told about that kind of instruction. It was given to my grandmother. She was born in the late 1800's, so taught around 1910. It's been largely discarded. You still get teachers who insist on something because "my teacher to me, because my teacher's teacher told her, because her teacher's teacher....". That is not a good reason.
That "old school" way was how I was initially taught. It caused me a lot of issues and forced me to rework my whole technique many years later when it was a deeply engrained habit. I think I'm still ironing out kinks in my playing that were caused by that approach. Do not recommend lol!!
…There is a reason the Taubman method is so popular…