I think the combo of "swing left" and "take the hands out of the swing/use the big muscles" pretty much ruined my swing. Led to some serious steering and a big up and out of it move for me. Most of these "catch phrases" may be a way of stating what some feel, but misapplied can mess people up. A precision system it aint!
It seems like you refer to second hand advice rather than a true & knowledgeable source.
If you go to the right sources you will find this as part of a very thought through system. After all this is pretty much what Ben Hogan did and a lot of the greats of the past and present.
But the "take the hands out of the swing" thing will mean something entirely different, like: Maintain leverage through impact and get as far away from a flip as possible.