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Evo happenned in the same time as all the other servers, the updates were merely mods that Grian installed.
Also, when a server is left without an admin for too long, the code begins to get fucked, and the server starts to corrupt. Because of this, admin society have a protocol that if this happens, the remaining server members are evacuated as soon as possible.
This means that other servers were watching Evo, and communicating with Xelqua in real time as it collapsed. All members had codenames and alternate identities while on Evo, because Grian set up Evo to be a safe haven for traumatised individuals to come to and heal together, so nobody outside really knew who the players were at the time, although friends and loved ones had come foreward in the aftermath of Evo, so while nobody knows for certain, a rough list of suspected Evo victims had been confirmed. The players that were not identified were:
-Grian
-Jimmy
-Salem
-Netty
Also, I absolutely headcannon that just after admin society became aware of Evo's admin dissapearing, Mumbo sent a condolence card to Pearl (The two knew eachother and Grian from being childhood friends)
Yes this does imply that Mumbo knew Grian was the admin and chose not to come foreward about it, my answer is that Mumbo knew people hated Evo's admin for "abandonning" his server, and did not want to force Grian's memory to be tarnished by the backlash.