The tipping point State, Colorado, was won by just over 5 points, so it was clearly not close and clearly not a landslide.
The only really dubious landslide case is 1980, because Reagan's PV margin wasn't that impressive, but the EC results were. All the other victories slightly below 1980 levels (see 1988, 1992, 1996, 2008) were NOT landslides in any meaningful way.
1980?? Reagan's PV margin was almost 10 points. That's pretty huge.
He got 50% of the PV IIRC. The margin was big because of a third party candidate. See 1992/6
