GarlicJam wrote: And, you exaggerate here anyway.
I dont really need to exaggerate, because we can make a fairly accurate guess as to how much the ball has moved using the reference pitches on the pitch + a bit of trigonometry to work out the angle of movement. Take the first ball in the innings...

At the release point of the ball, the ball is just outside the pitch marking for the protected zone. We know that this marking is 30.5cm/1 foot from the centre of the wicket, and the wicket itself it 22.8cm wide. The distance from centre of the wicket to the outside of offstump is 11,4cms, and therefore the gap between off and the marker 19,1cm.

The ball just before pitching. Its hitting in line with off-stump. Even taking the most conservative measure on the pitch of the ball to be hitting the very outside mm of the stump, and assuming the length is about 6 meters (the accuracy of the length is unimportant in the calculation for reasons I wont explain), that gives an angle of 0.9 degrees. If this ball holds its line, it will travel 9,4 cms laterally, so my originally assessment that it was hitting off/off-middle is actually an understatement - it going to hit middle stump.

Finally the edge. The ball as it passes the bat is now once again almost level with the protected zone marker. We can at this stage get fussy about the measurements, but Campbell's backfoot is on the crease line almost perfectly (1.22 m from the wicket) front foot down the pitch. The point of interception is probably somewhere near the 2 meter mark from the wicket, but let's stick to the assumption that if the ball has moved almost the full 19.1 cms from the crease mark to the off stump in roughly 4 meters, over 6 meters it will definitely move laterally to that point. Its moved laterally roughly 4,77cms per meter, so such an assumption would be very conservative.
Angle of movement = 2.9 degrees. Taking account for the original path of the ball, you add these two figures together and the ball has seamed about 3.8 degrees in total, at a very conservative guess, and about 5 degrees at a high end estimate.
Starc has been doing it with the red ball, with the white ball, with the pink ball.
Shane Warne's average leg spinner turned 3.97 degrees.
The highest average turning pitch in India since 2014 had 4.1 degrees of turn.
Even taking the most conservative estimate, that ball moved off the pitch give or take a fraction of a cm here and there, like the average leg break from the biggest turning spinner ever measured. I don't think you can say that is normal or Starc does it all the time.
I know this, because the average seam movement for Aussie seamers at home is 0.55 degrees in recent times. Its simply nowhere near what he usually does.