This is the problem of junk science, and how little people actually understand about things like geology.
To put it in perspective, when the current ice age cycle started and there were massive palm trees growing in Alaska, most of North America was over 35 miles farther north. And that did not have a damned thing to do with the ice age at all.
It has nothing to do with the location of any one continent, but the current arrangement. Ask any geologist, and they will point at the clear "smoking gun" of the Isthmus of Panama rising up and cutting off the current that used to pass between the Atlantic and Pacific close to the equator.
We are in an unusual time geologically over the lifespan of the planet, because as far as we know this is the only time the planet has not had either a single ocean or multiple oceans with clear openings near the equator but two large oceans separated only at the poles.