The claim that failure rates are the same YoY on the third slide is wrong.

The original Forbes article didn't claim a constant failure rate and it stands to reason a business that fails in the first 18 months simply failed to find market fit. That being the case, the survival rate would likely go up each year rather than down. [i.e. 18 months? 80% of the original total 36 months? 90% of the original total. Obviously not real numbers but it gets the idea across.]