Yup, it also calls back to the infamous Solid Snake quote about legends:
The legend of Big Boss keeps being passed on, as someone who was the ultimate soldier and so forth. But in reality he was a coward and hypocrite, and let someone else do the dirty work for him.
Solid Snake, on the other hand, is rightfully a legend but he refuses to be called one.
Big Boss was also
disappointing in the sack, and a premature ejeculator