This post has not been addressed in any detail by the side arguing the negative.
because every point in the post is either irrelevant (example below) or has already been debunked.
this "debate" has become redundant with both sides just repeating everything. nobody is changing anyone's mind here.
then there are the arguments that are not arguments at all. in the post you cite, z, one part states "chess tournaments are governed by strict rules and regulations". using this flawed logic, driving to work is a sport.
TL/DR