I totally am on board with back-of-the-envelope math, evaluating ROI, market size, etc. But come on. This was month #1, a good chunk of which was doing one-time tasks (figuring out what the hell the site would actually be, setting up the template, etc.)
If you want to fault him for something, fault him for the lack of market analysis to see if this idea really has some legs, besides citing someone else "making millions of a similar idea". E.g., a red flag was one decent sized advertiser telling him their ROI on podcast ads are not worth it.