diy silicon is definitely a cool concept but this project, while cool in itself, is not a step towards that goal. and that was (one of) my issue with GP post.
I understand what you mean, and you are basically correct. But nevertheless I see this project as a milestone as it helps to focus on selfmade FPGAs instead of soldering TTL chips to copy some hard wired retro systems.
If we someday will be able to print our own chips then they will surely be FPGAs because debugging and reprinting hardwired chips would be likely too expensive.