There are right ways and wrong ways of comparing languages. The right way is to treat both of them respectfully and compare them as different approaches and different styles, while still highlighting particular things that each excel at or elaborating on why they made different design decisions. This allows for enlightened discussion and can help an informed developer make a decision between the two.
Slamming another language that's actually in production while yours is not released is simply not a good look. Although I doubt the author had bad intentions when creating the page, there's a pretty harsh bias against the other languages and Nim in particular.
