Exactly. They left out a very important part of the story, yet Jon had to be stabbed. So they made up Olly, which had one purpose: suggesting the audience that Jon was stabbed because he formed alliances with the wildlings.
This doesn't change the fact that Jon marches to Winterfell, assuming he's resurrected in the book as well. But it does significantly determine how the readers see Jon and how the TV show audience views Jon. Respectively as an oath breaker and as an innocent victim of maleficent brothers in black.