Well , maybe I'm the odd duck here... But I disagree to the simple measurement result.
I haven't look at the detail measurement and data of that Belden website.
But based on my evaluation, this former Belden engineer do have a point. Your test had great flaws.
As with any measurement device, they had their limitation. Although many of older science claimed that their device limitation are well above the limitation of our biology mesurement system, it often proved wrong afterward.
For some examples we takes mp3 and 44khz sampling frequency. We used to believe mp3 makes no different at all, cause all it compressed are the loudness different that should be unable to capture by human ears. Same with the sampling frequency, 96khz and 192 khz shouldn't make such huge different by the measurement standard in where 44khz introduces. They used to think they capture "real life" sound at that moment based on science, and laugh of those vinyl recorder musician.
There are actually lots of similar so called "voodoo" in audio industry history, because they don't understand how hard to replica and represent a continuous analog wave that can range from near dc to 35khz. But as the technology advance in both DAC, ADC, amplifier, studio monitor, it make sense there is more and more revealing in the weakest part of the whole audio chain.
That being said, if you're not owning the most expensive ADC, DAC, amplifier and studio monitor, your weakest chain probably won't be the cable.
But all in all, I think maybe it's the source or the measurement device at fault. Possibly had very high capacitance, low crystal clock rate, processing system or slow transcient response that introduce some delay in the cable's signal. the source, cable and measurement device called a WHOLE chain of system for a reason.
IMO, the best way to test a cable is using a capable enough professional studio equipment to listen some Opera house/stage real orchestra performance (not those song recorded in studio and optimize for mp3/handphone device). If the source doesn't had enough transcient responses (like an all playing moment in orchestra) and the measurement device only measure static sound without proper spec... It hardly can justify the Transcient response of a cable is what it capable of.