Come on, Erik. This is the ridiculous gibberish of marketing people. A switcher is always switching and is always producing a ripple somewhere. It's the intrinsic discontinuous working principle of the switcher that causes the produce of ripple. You can decrease the ripple by additional measures, of course. But the switcher will never produce less ripple than a linear regulator, that

doesn't produce any ripple at all. That's absurd...

and a the frequencies in question doesn't suppress any ripple at all

If you took the time to read it all - an not out of hand rejecting the article - you will see that, in fact, a switcher can be better than a linear in suppressing the noise from the preceeding switcher. A linear has virtually no suppression at the frequencies of the ripple from a switcher.

why "following a switcher"? in these PFC days most regulators will

Erik