Is it true that do olde english bulldogs have pitbull in them based on the following text?

The Olde English Bulldogge is a recently created American dog breed. In the 1970s David Leavitt created a true-breeding lineage as a re-creation of the healthier working bulldog from early nineteenth century England. Using a breeding scheme developed for cattle, Leavitt crossed English bulldogs, American Bulldogs, American Pit Bull Terriers and Bull Mastiffs. The result was an athletic breed that looks similar to the bulldogs of 1820 but also has a friendly temperament.
yes