I think (THINK, NOT KNOW) that the premise is that if a couple of battleground states are in contest, that can impact the Presidental election determination, but the likelihood of all 435 House seats being contested is infinitesimally small. In other words, even if the House seats in the contested states are contested as well, the House will still have a very large number of representatives that can be seated, and the Speaker would have to be chosen from the party in THAT majority.
Thanks. That makes as much sense as anything. I do think the point is debatable, but I certainly see why some folks might think it is an approach that can be made to work.