Not a member of the project but here is my take:

You run the WireGuard app on your computer/phone, tap Connect, and it creates an encrypted tunnel to a small network box (the “FPGA gateway”) at your office or in the cloud. From then on, your apps behave as if you’re on the company network, even if you’re at home or traveling.

Why the FPGA box: Because software implementations are too slow and existing hardware implementations cost too much.

Internal or Internet: Both.