I don't think you can make any conclusion here... what's completely missing is how they chose optimum tire pressure.. and what it was?? 🤷🏾‍♂️

Velonews did a test for Paris-Roubaix tires and used an air shock to try to simulate the impedance/vibration losses a floppy human would add (vibrations making it past the tire go into your body vibrating it and that energy will then be lost as heat).. and something I don't think many noticed was that there seem to be NO CORRELATION between optimum pressure and tire width even same brand/casing in different sizes.. every single tire seems to have an inherent optimum pressure (could there be resonant frequencies for each tire in each size??).. and likely an optimum pressure on a given surface..

Interesting, but from a practical point of view... not sure what to make of this analysis actually...

[Edit] another factor that could contribute to above... could be the the subject of this analysis.. the vibration characteristic of tire when it's on a narrower rim and light bulb shaped or on a wider rim and more arc shaped are likely different... so maybe they ARE on to something.. but don't think it's fully hashed out... too many variables not held constant to flesh out I think..