Wait, are you serious? Deadspike has 28 frame start-up, and is only +3 on block. You can jump/poke/reversal out of it in many cases. If it's properly spaced, jumping is usually your only option. But still, Deadspike pressure is unsafe, and requires that you scare the opponent into not wanting to push a button or find a way out. Often time, the most effective use of Deadspike is to use it randomly in strings.
Examples
2A > 2B > Deadspike 2C > 6B > Deadspike 6C(2) > JCC > Deadspike Basically using it in places where people aren't used to instant blocking/attempting to get out. There is NO safe way to go into Deadspike outside of Deadspike > Rapid > Deadspike (which is gimmicky, still not entirely safe, and there are better uses for meter).
His REAL pressure strings look no different in CSX than in CS2, even with the barrier buff. Besides, barrier now runs out quicker in CSX.
He'll be fine, it's fucking Ragna, he's never been bad, and he'll never be bad.
EDIT: I lied, there is one safe way to Deadspike, and that is meaty Deadspike on someone's wake up. Guess how you beat that? NEUTRAL TECHING THROUGH IT. Easy to beat, again.