Well, I have no clue who this person is and or what he concluded from his testing.
My personal experience and testing and picking the brains of top players started in the '80s.
My conversations with Cole regarding what he prefered in the feel of a cue were enlightening. He played with a Joss West[Oops East] His lifestyle led to him playing for his cue when his pocket hit empty. He could call Danny Jane's and just say, "make me another", as his specs were on file. Cole at one time had 6 shafts that were all made to the same specs yet only one suited him.
My taste in cues has evolved.
Cue characteristics of weight and balance is just the beginning. The type and hardness of the tip is Huge. My earliest preference was for a hard Le Pro. The grain in a maple shaft along with the part of the tree its cut from makes a big difference. The taper and dimensions of the shaft makes a big difference. The flex in the shaft coupled with the materials used in the joint and ferrule all combine to give a cue a personality.
Personal preferences are just that. What's good for a person that likes to spin their rock is different than for a center ball centrist.

Different games favor different styles. Straight pool vs 9 ball is a contrasting comparison as 9 ball often calls for much longer trips around the table. Straight pool rewards pin point precision in the cueball resting spot after the shot. So more short precision cueball.
My cue making expert in the 80s was Roger Petit. He made me a 2 piece cue from broken bar cue salvage. A sneaky scalpel. With ivory ferrule and a small red fiber ring at the joint. A Stealth weapon, for sure. I even had a heavier shaft for the oversize cueball that was common back in the day. (That $60 cue earned a lot of money.)
My conversations with Cole brought a pole vault pole analogy. With the flex in the shaft being the character suited to cueball movement. More flex more movement less flex precision movement.

While on a micro scale the various elements from tip hardness to shaft flex along with weight , length and balance gives every cue a unique personality.