Previous posters are correct.
DataTank Mining is not selling or purchasing any hardware (as in hashrate, ASICS, etc) today, and prices are merely a representation/reference to make a business case. It is at the core of the business strategy _not_ to engage in such practice and bet on hardware. Hardware will be purchased in time for deployment, no earlier than that, at the price and performance that is best suitable to serve its purpose.
Hardware acquisition needs to happen at a certain point in time, no doubt. Because numbers cannot be pulled out of thin air, we are using today's known data for reference calculations. However, it can be safely assumed that the hardware will be cheaper (more competition) and that the same money can buy more hashrate (advancement of technology) in the future. Both cases are accounted for in the insurance sections: unit holders receive excess funds paid back via dividends or receive more capacity/higher hashrate in form of extra units if we are over-funded.
The reason why today's known hardware cost (large downwards trend) and production cost (very little change) are used, instead of guesstimating or making up numbers is because it's bad business practice to base a business plan on speculation.
Keep in mind that we run our own production line. We have produced ASIC hardware for third parties before, not only for immersion but also for heat sink users worldwide. Prior to that, early 2012, we have built and produced Spartan 6 based FPGA boards and there are surely a few forum users who could attest to that (info via PM if needed).
-- // --
Having said that, there will be a progress update within today, of which one particular point addresses exactly the risk of hardware acquisition. We have some good news in this regard but discussions are still ongoing.