We are talking about a specific claim ("If I stay dead two days the entire region goes nuclear") and then literally nothing happens if you put the claim to the test.
Well it's not like Gale could put his hypothesis to test himself, so he'd not know either way. He might believe it (and if the datamining thread is correct, seems like he does), but this doesn't need to make it true.
Now if you leave Gale in the ditch for a week or so, and then you resurrect him and can't use that as an argument that is the plothole.
