No. A jointer is used to flatten one face and then produce a flat edge that is 90 degrees to that face.
The reason you go to a planer is that a planer will produce a face that is parallel to the opposite face (but not necesarilly flat).
If you tried to do the entire job on a jointer you would end up with 4 flat faces but the opposing faces and edges would not be parallel to each other.
If you tried doing the entire routine with a planer the opposing sides would be parallel to each other but not necessarilly flat (due to the pinch rollers pressing the piece down against the table).
Is that confusing enough