Yes, the problem description elides a few explanations.

The idea is that there are two kinds of moves: "atomic" moves where we move 1 disc at a time.

And then there's a "big" move, comprising a sequence of atomic moves. One big move accomplishes one unified goal. An example of a big move is moving 4 discs from one peg to another.

In the problem text, whether a "move" refers to an atomic move or a big move is something left for the reader to infer.

A shortcut is to take every mention of "move" to mean a sequence of one or more atomic moves. But that clashes with the fact that Move is a type synonym representing only atomic moves.

Result: confusion.

More precise wording of the problem will help. I have nothing to do with CIS194, but allow me to thank you for the pedagogical bug report all the same.