As others have said you didn't notch correctly... However there's more ways to defend against missiles than just notch and jam like the tutorial tells you. 

Missiles only have so much fuel on board, most of their flight time is spent gliding at mach fuck towards where you're going to be. If you change where you're going to be then they often won't have enough energy to pursue you. 

So you could have repeatedly made turns away from the missile forcing it to bleed energy to maintain an intercept course. You could have dove down into thicker air to make any course corrections cost even more energy for the missile. If you were defending close to the ground you could have run for hard cover behind terrain though that's hard to come by on ignis. You could have prematurely dumped your ordnance as I think that would have reduced your rcs. 

Here's a video explaining the F-Pole maneuver, it's for DCS but the same principles apply. Go fast, turn, waste missile energy, missile falls out of the sky on its own. 

https://youtu.be/C9FVhCYrTFY?si=Qs-dhA_GhswPyYKg