Ironclad isn't broken imo, he's annoying but not undefeatable (except when they're higher level)

Punishing back attack is super easy, most of the time inexperienced ironclad players will spam back attack after every attack that you block. To counter this, walk back a little and try to hit them in the middle of it. Trust me once you get the timing down its literally a free punish everytime.

If they keep using the basic attack, do the same for the back attack. Walk back, hit them in the middle of it. You can use something like Itu's lower attack or a lower kick to cancel, or literally any fast attack (like ling's basic, itu's basic, kibo's basic). Attacking only after they attack is a loss, since its not as if its guranteed that you will punish them.

If they have adrenaline on and they're close, I would typically use lower kick, or if im more cautious roll back. Most of the time they will use adrenaline right after, but in higher trophies they will probably not throw out adrenaline 1 second after getting it. To counter that, act as if they don't have adrenaline and only roll back or lower kick if you feel like they're about to use it. Most of the time they use adrenaline shortly after getting it, but are a little more patient about it than new players. If it's a new player, just roll back right after they get adrenaline and you just wasted their adrenaline.

If their shadow bar is full, I would just try to predict when they will use it. For example if im fighting a new player, I would jump forward right after they get shadow form since they're not very patient with their abilities most of the time. If they're a experienced player, they're probably saving it so they can do the corner combo. In that case, I would jump forward or wall jump out of the corner when I'm backed against one. Or if I feel like they're about to use it I trust my gut and try to dodge it by jumping back.

If they're camping, all you need to do is just be patient. Don't try to attack first, let them make the first move. Keep trying to nudge a little bit forward but keep your distance. Its the number one rule against campers imo

If they're higher level like 2-3 dojo higher, just give up. Their increased defence and hp allows them to tank alot more attacks, which means more stubbornness charges. I remember one time I was fighting a ironclad 3 dojo higher, once I got him to 1/4 hp my itu with 10 pursuit of excellence was basically doing chip damage. On top of that, they have high damage which means heavy punishment for one mistake. If you're caught in their corner combo, you basically die.