It's not an opinion, it is a fact. You do NOT have to remove breast implants before burying people...simple as that. I DARE you to prove me wrong.
Perhaps his friend was referring to the fact that breast implants may have to be removed before CREMATION, though I am not 100% certain of that, but it stands to reason, I'd imagine the ashes left over would be pretty nasty with melted boobs in them.