Okay, so we can safely say that neither you nor I know of any data, testing, or evidence which has emerged subsequent to that study, which has disproved it or even attempted to do so. So logically, there's no reason to suspect the data or the study is anything but honest.
Here's a page from a website on ballistic studies. The page in particular is on .357 Magnum but it goes into some depth about velocity and wounding, including photographs of wounds (at the bottom) and details of the bullet and velocity. Which shows disproportionate wounding.
https://www.ballisticstudies.com/Knowledgebase/.357+Magnum.html
And here's the point. Disproportionate wounding was thought to be impossible with handgun bullets, but it apparently is possible. And if we for a moment assume that the information in both of the sources I have linked to, is infact truthful (and we have no reasons to suspect it is not), it therefore must be possible to attain similar performance with off-the-shelf guns and ammunition, simply by matching closely the bullet velocity, expanded diameter, penetration depth in gel, and weight of projectile.
Two examples that fit nicely with the loads described in th links would be: a 125gr JHP at 1350-1400fps in .357 Sig; and a 155gr JHP at 1300-1350fps in 10mm.
And to answer your question regarding how much that would matter. Is it not obvious? To increase wound diameter substantially (which can be clearly see in the photographs) increases not just the potential for blood loss and the speed of that blood loss, but also the potential of actually hitting something immediately or rapidly vital. Surely anyone who looks at the size and extent of the wounds I linked to, can understand how such wounding could quickly prove more debilitating than a tiny hole only 0.54" - 0.68" in diameter of crushed tissue.
So without even discussing the potential of the ballistic pressure wave, or remote wounding, and simply looking at the potential for direct and disproportionate wounding of higher velocity and energy projectiles, we can see there is certainly a benefit.