He points out that minimalism isn't the "best" design, just a different style and a designer has to pick the most appropriate one. While I wouldn't call this an earth shattering new insight, it's still is a fair point.

But his examples are poorly chosen to underline his position. You can't point to designs that have come and gone and disprove that simplicity is an attribute of good design. He should have pointed to other contemporary styles that are clearly not as simplistic as possible but still "good" (for example the Guggenheim Museum in Bilbao [1] or the Beijing National Stadium [2]).

[1] http://en.wikipedia.org/wiki/Guggenheim_Museum_Bilbao [2] http://en.wikipedia.org/wiki/Beijing_National_Stadium