He wasn't told he could lose it. He was told that if the bleeding was too heavy he might lose it. He said " he said doctors seemed more confident about saving his penis and testicles".
So it's apparently not some different surgery, it's just some doctor who wants the money saying "Sure, I can save your dick, don't worry about it." and another doctor giving him a story I bet is a lot closer to the truth which is "If I have to pick between your penis, and your life, Your gonna lose your penis."