I do have many years of working with Xilinx in my day job.
So do I, and so do a lot of other people around here.
The only way your numbers add up is if (1) Xilinx is losing enormous amounts of money on you (if so, congratulations!) or (2) you have found some way around the laws of thermodynamics and the DC Switching Characteristics data sheet.
I call scam unless you match some Xilinx part numbers to those hashspeed claims.
- e