Impressive but not record-setting or even really competitive in most cases. Powerlifting and Olympic lifting success depends on skeletal structure- for various lifts that's things like arm length, hip width, upper torso to lower torso proportions. These things count for and against you in various lifts and go to mechanical leverage advantage.
This accounts for the frequent success over the years of little people in the lightest weight classes and the similarity of champions' appearances.
To speak to just one lift, in general the narrower the hips, the stronger the person has to be to squat the same weight. What squat aspirants want is wide hips that transmit the power being generated up through the torso in a straight line.
Deadlift would-bes want short torsos and long arms, a mid-80s lefter named Lamar Gant being the clearest expression of this type of physique.
And so on and so forth. Bodybuilders want impossibly narrow hips accompanied by impossibly broad shoulders.
This separation of the size of a muscle, specifically, the cross-section of an individual muscle's fibers, on a single individual from those same fibers' strength is new information to the world, if true.
On a single individual, a muscle's size varies in direct, though not linear, proportion to its strength and visa-versa.
Between individuals of course a smaller muscle may be stronger than the same muscle on another individual.
Previous understanding was hypertrophy happened and as a consequence the muscle was stronger and, visa-versa, a muscle was stronger when hypertrophy happened and the two were consistently and directly related.
But what this research is saying is that, for a given unit of hypertrophy, there can be varying amounts of strength increase, depending on what type of training effected that hypertrophy.