I'm surprised he doesn't talk much about direct cost (rather than engineering cost). A decent FPGA developer kit will cost several thousands of US$, more expensive even than high end GPUs.
However if you're doing the sort of work which isn't just hobbyist stuff, you're going to spend 1000s on a board. This is the sort of thing commercial developers will be using: https://www.xilinx.com/products/boards-and-kits/ek-v7-vc707-...