I think that Jen's is trying to get the design turned into an ASIC (custom microchip) rather than FPGA. Just like the C64DTV.
Then the chips will cost $1-2 instead of $20
I am curious about the NatAmi, his base platform is Jen's C1 motherboard which was designed for a Super C64. It is very small in capacity, even compared to a MiniMig.