Is nash v-reversal strike invincible until it recovers?

nash

#1

Other than a video I’ve seen using fireballs, I’ve never seen someone punish it with a hit. I also spent 20+ minutes in training room trying to, with 0% success. You can throw the startup/recovery but is there a way to get a bigger punish without a fireball? Is it strike invuln but not projectile invuln?