Things which can’t self improve can’t be antifragile by definition. NNT alludes to this multiple times - systems together with processes and people running them can be antifragile, but just things cannot.
I postulate the grid as a whole is antifragile, but not enough for the renewable era. We still don’t know what was the root cause of the Spanish blackout almost 24h after it happened.
How do you make those systems antifragile rather than simply highly resilient?