I see one "we" in his comments ("We're happy to accept the criticism when it is valid. This isn't."). I'm also not sure what experiences implementing webgl he's supposed to talk about except for his experiences at google. Making an argument based on actual implementation details is what you'd want here.

As it happens, I have this: http://news.ycombinator.com/item?id=2621415

It's an attempt to have it both ways, appealing to authority without making the authority publicly responsible for the statements.