That's straight up awful in 2024.
27mm external means you can't run 28C tyres, as they will mushroom out, slowing you down. So it largely negates the benefit of a 50mm deep wheel --> severaly outdated design.
The weight for such a narrow rim wheelset, with carbon spokes, is also really bad. In fact they do say they use T700 carbon, which nobody should be using in wheels, unless they want to ride really low end stuff. You can get a quote from Peter from Xiamen carbon speed for full T800 rims that will cost much less, be much lighter, wider, and better.

That wheelset is objectively a dog of a product in 2024.

73deg seatpost is frustrating for those of us with short femurs! The frame looks great, but I need something steeper

The link you showed clearly states that the rolling resistance goes down as tire size goes up, and we know that wide tires are more comfortable because you can run lower pressures and have the same air volume in the tire. Whether you feel that difference is up to you, but the physics doesn't lie. Wider tires have less rolling resistance and are more comfortable.

Now, it's possible that after a certain size we start losing speed again, but 32s aren't that size (NorCal Cycling tested 28, 32 and 34 and found that the 34s were slightly slower than 32s, they were on par with 28s, with the 32s being the fastest ).