I'm certainly no expert on the matter, but I'd doubt anyone who said they were. The first thing that comes to mind is that the alt-right is nationalistic and has no problem with some form of collectivism. The far-right, on the other hand, is much closer to the min part of minarchism.

The alt-left, if it is presently a thing, is even less defined than the alt-right. But in the interest of maintaining symmetry, I'd say that it would have a progressive agenda by way of individualist means. Emergence?