Total bullshit. You have what you have. Short of pumping (which can destroy the tissues and leave you with a bloated sausage), your size is your size.
There are some surgical techniques, I understand, which are used in radical situations to give the appearance of greater length. It involves the severing of a tendon which allows you to hang out more. But the process is expensive and painful, for a limited result.
Just learn how to use what you've got well. You'll do fine.