It seems the people concerned about funding are those that don't...

It seems the people concerned about funding are those that don't currently hold MGT and are down ramping this stock.

The PFS is used as an early stage analysis of a potential mining project.

The DFS follows the PFS and is the most detailed and comprehensive study, determining definitively whether to proceed with the project.
The BFS is the final stage before development, including the necessary detail on what terms financiers should lend to the company. This study determines whether the project is profitable and how much capital will be required, allowing for the bank and engineers to determine if risks are acceptable, and confirm that the project is viable.

It will be at this point that you will receive a better indication about how much the project will cost and how the company plans to finance it. It is still very early days.