the nintendo seal of quality never was a certification of the game's "quality". it was there to certify that the game you where buying was licensed by nintendo and not a bootleg or a game made on stolen/unofficial dev kit.
And wikipedia says
The gold starburst seal was first used by Nintendo America, and later Nintendo of Europe. It is displayed on any game, system, or accessory licensed for use on one of its video game consoles, denoting the game has been properly licensed by Nintendo (and, in theory, checked for quality).
He's not wrong at all. The "quality" that was checked was in no relation to the subjective quality of the game itself, rather the quality of the electronic components in the product. As in it wouldn't blow up your console. In effect, it worked like the Underwriters Laboratories.
The Playstation platform is agreed by most to be the birthplace of the finest 3rd party libraries. I would think twice about writing such ignorant nonsense.
Nintendo knows they made a mistake and Sony's policy attracted some of the finest games in that era.
One could just as easily argue that the SNES had the greatest 3rd party line up in history. But it's irrelevant to his point. Sony's liscensing policy did open the doors for shovelware. And while many think the Wii holds the largest supply of shovelware, the PS2 actually holds that honor and by a very large magnitude. It was simply fortunate enough to also receive a lot of quality 3rd party support to balance things.