Sure but they give a nice explanation of relative cost of pcb production, they split the services from the production cost.
In accountancy terms yes, but the actuals costs of production are offset/subsidised by their services. If you want them to fab only, I bet their costs will be structurally differently because this is just how the technical services industry operates. The profit margin is in providing expertise, even though it's debatable how much expertise is required in PCB design, most courses are a day long; experience is of greater value. The same is true in the building industry, builders don't charge by the brick but by complexity (hours).
Before I took up my current job, my predecessor used a lot of external design and production outlets so we've a lot of experience with this. If you're being charged for PCBs by the square inch, something is wrong unless there is some exotic requirement like space qualified materials. Or it's a bit of a scam, i.e. they get you to go smaller (cheaper) then stealth increase costs because of the increased complexity and you're now having issues from a bunch of noisy components which are much closer together.
Don't worry, we can also supply some lower noise equivalents at preferable rates. NCAB don't do that but their niche is making PCBs for people who can't make their own. There's a reason they're not making high volume PCBs for Sony, Microsoft, Apple or anybody big in the consumer space, their economics are very different so you're can't really use it as a basis.
Their
website does have some good visualisations of multilayered PCB production which illustrates the relative complexity. But in real cost terms, it's way more complicated, especially if space is at a premium - which arguably it is in a console.