This principle (as mentioned in the Dogal Hellborg marketing verbiage at the above link) - that string stiffness causes higher harmonics on the string to be out of tune (which, as I said, can be seen on a good tuner, and can be heard in a Jamerson low E for example) - has been recognized for a long time in the piano string world (and analysis was published long ago, and piano string construction reflects it). Not controversial.
With regard to bass guitar strings specifically, where the problem isn't as severe as with the thick piano strings but does still matter to many people (thus, Cobalt flats' widely spaced outer winding vs e.g. La Bella DTF), there was also a scholarly analysis published recently (maybe the only such paper dedicated to bass strings specifically, but as I said the principles are the same).
Trouble was, that paper was suitable for a scientific journal and wasn't meant to be readable by the masses, so our introduction to the paper was what a newspaper story said about it. And what the newspaper said about it was a little sensational and ridiculous, and *that* was what was linked to us at TalkBass, unfortunately, and that thread was mostly unfortunate.
So at that time I went directly to what the paper itself said (thanks to a link someone provided), and I came back and reported to TalkBass that the principle was valid and that it would be better to ignore the newspaper story.
Now, this thread appeared.
Thanks to the original poster.
I read the Dogal marketing verbiage at the link given above (and if I recall correctly this is the same thing that DR said about them),
and I came back here to share with y'all my opinion that the claim is legit.
The principle is legit, just tellin' you bro.
Doesn't mean anyone will necessarily like the strings. But many people here do want their higher overtones to be in tune. We await one of those people to spend the money and report back.