This doesn't make any sense to me. My mother spanked me (and used a wooden spoon, because the "use an object other than your hand" belief was big), and our relationship is fine. The rocky part of my childhood that I had to get over had nothing to do with being spanked and had everything to do with emotional issues. The relationship I have with her has always been close, even when I was a kid. She has since admitted that if she had to do it over again, she wouldn't use a spoon, though she probably still would have swatted us. And my sisters and I have agreed never to put her in a home.
Positive reinforcement and negative reinforcement are not mutually exclusive. Giving positive reinforcement when a child does something good, doesn't mean you don't give them consequences if they do something wrong.
I agree also that how a child is punished should depend on who the child is as well. I probably would have ended up the same person I am, spanked or not (none of the spankings particularly stand out in my min), but I know my younger sister was spanked because she did things that she'd been talked to about, grounded for etc, repeatedly and she just wouldn't listen.
I'm not sure how to explain exactly how spanking is done *not* in anger, since you seem to refuse to believe it's possible. The spanking is a decided upon consequence that is then carried out. It's a calm thing, you know it's coming, and your parent isn't yelling at you. Once it's over, that's it, the consequence is over, you hug and move on.