Not a chemist either (took organic and baby pchem a while ago tho), but I believe he means it would just fall apart since there's no strong force or weak force

Not a chemist either (took organic and baby pchem a while ago tho), but I believe he means it would just fall apart since there's no strong force or weak force to keep it together the way it would for a typical atoms. Muon's a fermion so it can't disintegrate into smaller atoms.