Roy Moore is wrong and so is this guy.
First of all, the Supreme Court never defined marriage to begin with, so it isn't redefining it. It is only addressing the issue of equal rights under the law. The laws and legal benefits of marriage now will extend to same sex people. Period.
No one told Wikipedia to ....define marriage. Th definition is an opinion, just lke an asshole, and there's billions of them.
Non Greek "philosophers" do not have the DNA to address stuff like that. It is just shallow convolutions of loud thinking.