TIME TRAVEL! Done.
Seriously though, trying to explain time travel, particularly when multiple iterations of an individual are meeting each other, gets CRAZY complicated. Even an immortal, thousand year old, doctor just calls it 'timey-wimey stuff'. But to try and explain it: Old Thor exists in a POSSIBLE future, which is now defunct, meaning it no longer actually exists in our Thor's timeline. In Old Thor's timeline, he probably did not make it through that portal, creating a split. In his timeline, he returned to Asgard, lived out the rest of his days, watched the Avengers fall, humanity evolve, his father die, etc, and eventually the Godbutcher returned, laying siege to Asgard and butchering the rest of the Gods, til he alone remained.
In OUR Thor's timeline, as you've seen, he DID make it through the portal, but the difference in seconds (if that) resulted in the Godbutcher arriving WAY before our Thor arrived.
Get it?
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