They can't even correctly edit their own web page: "Why You Should Proofread Your Thesis By Professional" Should be "a" Professional or, "By Professional Edit

They can't even correctly edit their own web page: "Why You Should Proofread Your Thesis By Professional" Should be "a" Professional or, "By Professional Editors." As is, it's wrong. I suspect they are not using professional editors at all. Perhaps they are merely running files through Grammarly or Word's own spelling/grammar checker.