I read the essay but only once so far, so I may have missed some things. It doesn't seem to point out any flaw in the theory but rather try to present an alternative. But this alternative I find utterly unconvincing because it is full of errors and holes. I would really like to provide critique to all those points but that would become a piece longer than the essay. If you like I will elaborate on specific points.
George Reisman has developed a brilliant, modern presentation that dismantles the problems with the labor theory of value, and the related exploitation theories. [1]
[1] https://mises.org/library/classical-economics-vs-exploitatio...