I agree with what you're saying, but I don't believe Mullvad push that narrative.
In the article, they warn that "DNS leaks may have serious privacy implications for users".
Looking at their marketing homepage, they say "Using a VPN alone is not enough to achieve perfect privacy. There’s simply too much data being extracted through most browsers."
It also seems like there's some misunderstanding about what the internet is in general here or a really bad misrepresentation ("you're not on the internet because your packet traveled over wavelength" wtf):
In the article, they warn that "DNS leaks may have serious privacy implications for users".
Looking at their marketing homepage, they say "Using a VPN alone is not enough to achieve perfect privacy. There’s simply too much data being extracted through most browsers."
They also have this expansive analysis of the major threats to internet privacy: https://mullvad.net/en/why-privacy-matters/how-mass-surveill...