Dr McCabe was a member of the US Geological Survey Assessment of global oil supplies, and says the figures show oil will last for many decades to come.

This was the survey that applied the US reserve growth phenomena (of proven reserves) to world wide IHS database reserve data. The methodology has been discredited by multiple sources. You can read about it in detail in the Energy Watch Groups Oil Report

The second point of critique refers to the fact that – as is known to all experts - the growth of
reserves in the USA in the past was much higher than elsewhere. This is a direct consequence of the regulations by the Securities Exchange Commission (SEC), which for financial reasons call for very conservative evaluations at the beginning of the development of an oil field. This US practice leads to systematic underestimations.

For these reasons this marked reserve growth in the past was only observed in the USA and can not be extrapolated into the next 30 years, nor even less can this pattern be applied to the whole world.