Small note, @ 18:47 in the video. the PS3 had it's first node shrink from 90nm to 65nm during the FAT model's life cycle, so the process change had already happened before the slim was even released and the 65nm to 40nm shrink happened within the slim's cycle and the PS2 had multiple node shrinks in it's FAT model phase, well before the PS2 slim, as well.
So, no, a node shrink never "Historically" happened in the transition from Fat->Slim or Slim->Super Slim.
Not too sure about the PS4 since not a lot is out there for the different hardware revisions (the were at least 3 different revisions to the FAT PS4, 11 for the slim and 6 for the Pro).