Ok so after spending a couple of minutes in training mode, I'm pretty sure the Deathstroke matchup isn't that bad for Black Adam after all. In fact in the end it could end up being in BA's favor lol. 5-5 at worst imo.
Here are my notes on the Deathstroke MU:
-His Sword Flip reversal is around -15 on block which means we can punish it with: b2, 2, f2 and b1. More specifically, the best punishes are:
1. b2,3, 1,1 xx black magic, dash, b2,3, u, 1+3 (32%)
2. 2 xx black magic, fj2, (1,1 xx trait) b2,3, u, 1+3 (25-33%)
3. f2, 1 xx black magic, dash, b2,3, u, 1+3 (27%)
4. b1 xx black magic, fj2, (1,1 xx trait) b2,3, u, 1+3 (25-33%)
5. b1 xx black magic, fj2, 2,2,b1, hold forward, b2,3, u, 1+3 (27%)
-His Sword Spin reversal is safe but negative. Reverse the pressure. I suggest using b1 as it is +4 on block.
-From full screen the best thing to do is crouch block then take a few steps forward and crouch again.
-If you are far away but not full screen, you can actually react to the Machine Gun animation with a jump forward. From here far dive kick will hit. You can use EX version for a full combo: EX dive kick, dash, 1,1 xx black magic, dash, b2,3, u, 1+3 (32%)
-Use Black Magic when Deathstroke loses his zoning advantage. After blocking his non-EX machine gun or quickfire/low shots, Deathstroke loses his zoning advantage. Which means if he tries to shoot again he will flat out lose to lightning strike or black magic. Obviously the preferred option here is black magic as it allows a combo. Since it can be hard to get in on him you should always do a Dive Kick after landing black magic from far away as it puts you right next to him.
-If you land black magic from full screen, you can also dash and use Super. If you land black magic from far away or midscreen, you can dash twice and connect 1,1 to combo. This is universal tech but especially important to keep in mind in this MU.
-If you duck under or block any of his projectiles from far away, you can do a full dash forward safely and crouch block the next shots in time. The only exception is when you're in midrange, if you try to dash he can hit you in time before you're able to block.
-Thankfully, Deathstroke cannot shoot downwards while in the air. He can only shoot straight forward or diagonally up. This means there is very little risk in trying to throw black magic from far away after blocking his shots. If he jumps over or blocks black magic he can only punish for 6%. 16% if he spends meter.
-Only jump on reaction to Machine Gun. Never on anticipation. Why take the risk? He will alternate between ground and air control, especially vs Black Adam. He HAS TO otherwise you will get in for free every time right? And that's exactly what we're going to take advantage of! We will just wait for him to neutral jump and then take advantage of that opening to close distance or inflict damage.
-If you see Deathstroke neutral jump, dash forward once or twice. dash once and try to catch him as he lands with black magic or lightning storm. If you feel like trolling or getting in his head, you can try to throw a far bomb right under him.
