I would not discount anything written by Wurth. Or by Panasonic and any major mfr.
BTW it does not claim it is the best, it simply compares caps, and also measures their influencing THD. Nowhere it claims that they are the only ones whose caps will not contribute anything audible.
You might as well discount Tektronix datasheets or user manuals, using that logic.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
I've been using their products for a while. I do know they acquired a Chinese place that makes connectors.
But many a product was and is built in Deutschland.
I use their connectors, ferrite beads, chokes (the power inductors were the 1st product of theirs I ever used, and was impressed with the quality) of all kinds. Never used their caps. Though I am sure they are fine also.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.