I saw the original article and I thought it was very nerdy (made me smile). To see John give it a shot, just made it way more interesting. I think I would agree to John’s take that cost would not be an issue.
The original article’s point was that there are far better allocation of resources to achieve the goal of the death star then the death star. But if it is basically free to construct one, then why not an all of the above approach for such an advance civilization!