We've discussed these two before.
Neither of these two approaches are actually sideslipping but are incorrect alignments with the runway (747 to the left, MD-11 to the right) followed by some last-second correction that breaks all the rules of flying (which starts with "approach must be stabilised by a stated elevation and distance from the runway"), and which every airline instructs its pilots they must follow, or initiate a go-around and try again.
Sideslipping is where you are following the desired approach path but because of a crosswind that would blow you to one side, you have the controls crossed with the stick (ailerons) to the right but the pedals (rudder) to the left. You land with one wing low.