Not at all.
His statement was very clear and simple.
He stated a 20% CAGR for the decade ending 2016, beginning in 2006.
Then he stated each years return from 2018 though to this year.
So it's easy to calculate.
The bad years are already counted for in his 20% CAGR, that's the definition of CAGR.
And remember this is unleveraged, so actual returns far higher.