His opinion is biased and he doesn't know what he's talking about.
Because he likes javascript?
To the exclusion of other things he doesn't know anything about
Of course he is. He even admit it. It's on the second paragraph
> you can’t really be objective. So yes, I’m biased.
Just because you decide that someone is "biased" doesn't mean that you don't have to address their arguments specifically. We have more reason to think he knows what he's talking about than to think that you do.