This is not PhoneGap 101 ... nor is it an explanation of why mobile apps are still relevant (is that even something people are questioning?). It's essentially a biased hit-job on PhoneGap claiming that it's too difficult to understand in order to promote what I guess is a competitor ... something called Mulberry.
Mulberry utilizes PhoneGap's technology, so they have a symbiotic relationship, not a competitive one.