Take it with a huge grain of salt.
Hazardous levels of sodium with this one.
What matters is not the "268% higher" failure rate than whatever they are selling. It's the 65% failure rate of projects using Agile.
That said the true question is how they define failure? Missed deadline? Project stopped? Etc.
Reminds me of the study saying "a teaspoon of honey per day is healthy" with funding from the American Honey Something Association.
Hazardous levels of sodium with this one.