I'm saying this so atleast it looks good that Black Wing Accelerator basically nearly killed Touma in this way rather than the same plan defeated him before did again. I mean, it's no different than how Yhwach took the L despite having all of the cards on the table or Sephiroth constantly dropping the ball every goddamned time.
No, but changing the past it useless against the Am, we see it with tsukishima ability (which can change the past) been incapable by itself to negate a future manifest by the Am so even if Goetia goes back and Kill Yhwach in the past, the Am would be able to negate its death (like he did in the...
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Somebody needs to re-read Bleach because not what fucking happened at all.
Orihime's Shunshunrikka literally rejects phenomena and returns them to their original state. Acasuality is literally not being affected by Cause and Effect, they are not remotely the same thing.
Besides, we long know that Orihime's abilities can be stunted by various means of too much reiatsu screwing with the body that she can't heal it properly or at all.
Goetia literally has access to 3000 years worth of Human History, enough that it rivaled a Matured Tree of Emptiness that was hosting an actual Galaxy within it that had Gamma Radiation and screwing with Physics at large.
Even if we pretend that the Soul King's power is being used to keep the 3 Worlds together, the closest that would be... is Large Planet+ levels at best. Goetia would murder Yhwach like an ant.