Hi Stef, don't worry too much.

Whoever voluntarily steps into the JS arena, touching a topic like how to best build object/type systems, should not be surprised by a hard questioning; especially if that person somehow presents the topic in a way that makes people which are rooted deeply in exactly that matter wonder whether this persons is just an enthusiastic fresh convert or an unreflected fanboy.

You touched all the necessary points which the article totally lacks. And you did it not too harsh at all. On the contrary; a matter should be discussed exactly in such a professional way.