The "rules" regarding twist rate are repeated relentlessly. Often by people who have heard it over and over but who have never really tried and tested this irrefutable knowledge.
So, it is correct in a general sense but well worth your effort to try it and find out for yourself.
A couple examples:
I had long ago a 58 caliber with a fairly fast twist. In the neighborhood of 1:30. It shot everything well but it was exceptionally accurate with a patched ball and 60 or 70 grains of goex ff.
For several years we had a regular in our elk camp who was both new to hunting and shooting. He had a fast twist 54 inline that he loaded patched ball over 90 grains of goex ff. It was not remarkably accurate, but I watched him shooting with completely adequate hunting accuracy at 50 yards.
A couple years ago we had some folks at an organized shoot with a 50 fast twist inline. That range had a safety agreement that specifically allowed onl PRB. They were inexperienced with ML but a couple members jumped in and worked with them and soon they were regularly hitting a ten inch gong at 100 yards off the bench.
So, ignore the experts and become your own expert.