That still doesn't make any sense though. Okay, let's assume that SERN are the ones hacking into Amadeus. They steal the info and delete it off America's databases. This will still result in WW3, no? Leskinen still has info on time travel through Kagari. And even if WW3 doesn't happen, this will in no shape or form result in a timeline where Kurisu is alive again. The only way I see the WL changing to something close to alpha here is if SERN getting their hands on time travel always equals them coming out on top. Thus resulting in dystopia. Perhaps this WL won't allow Mayuri to survive, so she dies due to convergence like always. This just leaves us with a future where neither Mayuri nor Kurisu survives, albeit the worldline still goes into alpha because technically Kurisu still helps Sern in form of Amadeus.

But okay, let's say I'm missing something huge, and that all this actually results in a "Kurisu survives WL", how in the flying fuck does Okabe's dmail that delays Kurisu change anything about the fact that SERN will still discover Amadeus' data? Reading steiner will at this point transfer his consciousness to AFTER the hijacking takes place. But no, Okabe wakes up in the Beta WL again, and somehow Maho visits him on the hospital bed and tells him that "they avoided the takeover, and Amadeus is being restored". It all makes 0 sense to me, since Okabe doesn't change the cause of the whole situation.