"Anchoring was never a component of the golf stroke. Why? Because there never used to be agronomic practices that made it even imaginable that anchoring would be a useful method. It was only the increasing of green speeds that made this perverted stroke useful."
Garland B. -
I think you are confusing coincidence with causation. Golfers have been suffering from the yips for as long as the game has been played. Leo Diegel, Ben Hogan, Sam Snead, Johnny Miller, et. al. all developed the yips when green speeds were in the single-digits, not the low teens.
Sam Snead, unlike Ben Hogan, decided to do something about it. He developed alternate techniques for putting. Charlie Owens developed/introduced the broomstick putter more than 30 years ago, well before green speeds reached double-digits.
As someone who has yipped his fair share of putts, I can say that putting on fast greens is easier in the sense that you can get away with taking a much shorter stroke.
DT