They pointed out several so-called fallacies which the Psalmist makes. But after reading the page, I was not worried one little bit. In fact, it reinforced the words that are written here. Most of what they said showed that they did not even understand what Psalm 53 is on about. For example, they made the mistake of thinking that 'fool' in the context of this Psalm means one who is not intelligent, one who is stupid.
All atheists are dumb.
It's obviously not correct. But that is not what the Psalmist means. People can be very intelligent and yet deny the existence of God. You can still be an intelligent fool, by the biblical definition of the word 'Fool'. The Psalmist is not saying that atheism is wrong because all who hold to it are unintelligent.