I realize that this is a dead thread - I just googled "Antifragile" and "Mr Money Mustache" to see if he, or anyone else has made the comparison, and that's how I saw this thread.
He specifically says that resilient is NOT antifragile. On a sliding scale, resilient is in between fragile and antifragile. Resilience is the ability to sustain shocks, but his conception of antifragility is a state in which one actually flourishes and grows from shocks, hardship, and stress. Steel may be resilient, but be muscles and bones are antifragile because they actually grow stronger from facing resistance and stress.