The lables for rig count and IEA are swapped in the rig/production chart. It freaked me out seeing such a vast difference in the IEA and EIA figures, which are always reasonably close. Blue is rig count and the dark red/green is production. This is very telling and goes a long way in refuting the standard argument that high prices will cause more drilling and more oil. A similar chart for Saudi Arabia would probably look the same.

That's basically the argument of the piece. A collapse in the marginal return on effort of drilling is probably a symptom of being very close to peak.