With Dyson dead, those components later being destroyed and Sarah lowering the benevolent T2 T-800 into a vat of molten steel, surely that was enough to avert the apocalypse, right?
Miles Dyson, the main person responsible for Skynet’s creation in the future, sacrificed himself in Terminator 2 to blow up the headquarters of Cyberdyne Systems, which had housed the damaged CPU and right arm of the T-800 from The Terminator.
This marks another example of the river of time being diverted, but ultimately leading to the same destination.