My wild man's guess... Nanika's eldritch abyss is also either/both timeless or/and quantum, so they can access either a past or alternate reality iteration of the computer in its unharmed state. The broken computer was switched out for an intact version of itself, not fixed.
Gaze...Whoa!?...Huh?What's going on... This is scary...Huh... The computer is fixed...SparkleDid it fix...?The data was fine too.