Where is this focus about Angular 2 sucking?
The author is in fact happy about Angular 2 being a re-write. Read the section under Problem 6, where he calls the proposed complete re-write of Angular courageous and laudable.
Now he says this is a problem for Angular 1.x because there's no carry-over of knowledge into 2.x, but that's in no-one saying Angular 2 sucks like you are suggesting.