I read it and I gotta say it sounds ignorant to me: lots of people have bootstrapped systems using Forth. It's not as common these days but it still happens.
And I think the wiki page predates sectorlisp, which project answers (in my opinion) the challenge, no?
The whole point is that there are an awful lot of talkers talking a big game but no none of them ever manages to actually show something working.
The challenge was presented.