Belden 8219 has a capacitance of 26.5 pF/ft which isn't particularly low. Certainly not half and it is normally used for radio frequency applications.
Check against the capacitance in these various cables:
Audio Cables Compared and Recommended
That is a very informative chart you've provided for us. Thank you. That was a lot of work for the fellow who compiled the information.
It seems that the capacitance ranges from Fender Platinum Acoustic at 147 pfd/ft, (Is that a type-o?)
down to Atlantic Quality Zerocap at 3 pfd/ft but with an asterisk that denotes a much higher value, and that the cable is "active?" Cable, in and of itself is not active. So let's throw out the high and low figures because they may not be accurate. The capacitance ratings now run from 50 to 11 pfd/ ft.
The author of the comparison chart also comes up with his favorite best five that don't account for flexibility and a top five not taking price into consideration. Those ten cables run between 25 and 50 pfd/ft. Belden at 26.5 is better than most of these and quite flexible and very inexpensive.
When I said half the capacitance, I failed to mention the specific cable, but it was one of the cables listed by Belden for use as guitar instrument cable. I apologize for not having the details on the other cable as I did that comparison a couple of months ago.
The cables in the chart you provided not only were graded by price and capacitance which are both objective comparisons. Many of the ratings offered by the author were, in his own words subjective. So the final ten where graded mostly as the author's opinion. Likewise, my offerings about Belden 8219 are solely my opinions. I just suggest that it should not be overlooked when considering instrument cable if making up your own.
You are also correct in that Belden 8219 is primarily designed for RF (radio frequency) use. I don't work for Belden and gain in no way by mentioning it here. In my 43 years as a broadcast technician, I have used a lot of this cable for RF, as well as audio. If a cable is good for RF, it will be good, perhaps even superior, for unbalanced audio use.
You will not be able to find ready made cable assemblies comprised of this cable. I have been rolling my own though long enough to feel, IMHO, that this cable can rank right up there, if not be superior to some instrument cables used for guitar and bass. One of the characteristics is because it is designed for RF use, it must provide excellent shielding, and does so without being stiff. Proper shielding is more difficult to achieve as the frequency increases.
If it works well at RF, it must work well at Audio. But again, that's just my opinion.
The point is that there are many different cables one can use. Belden just happens to be trusted around the world when it comes to posting specifications that are reliable, repeatable and without hype. One must consider many factors when choosing cable, if any of that matters. If you like a cable for its color or brand name alone, then you are in luck, as there are a lot of choices. And while most folks probably don't make their own instrument cables, those who do, will want to look at as many options as possible. I simply present one option that most folks outside of my line of work may not consider.