There is much to commend this article, once you get past the highfalutin (and frankly, a bit ridiculous) style of prose.
However, Julian clearly misunderstands the concept of cost of capital, and his objections to the Damodaran model are flawed as a result. To be sure,
I also believe Damodaran's model suffers from deeply flawed assumptions. But Cox's suggestion that 0% cost of capital is appropriate is also a gravely mistaken assumption, borne of, apparently, a total misunderstanding of the concept.
Using equity to capitalize a balance sheet carries with it high costs, not zero cost. Further, using convertible debt to capitalize a business carries equity cost, in addition to debt cost. To propose that Tesla's cost of capital is equivalent to the coupon rate of their convertible debt is preposterous. And to further assume the coupon rate of the debt is the only cost of tesla's capital investment in the firm is an even bigger mistake.
God forbid Elon Musk assumed equity carried no attendant cost. We'd be sitting on shares diluted into worthlessness if he did. Fortunately, he does not.