I'll say up front that this is one where I heartily want to get out my soapbox, so I shall attempt to rein myself in. I've read work from the person this article is quoting and her colleagues before, and I feel very bad for her and the way their position has been seriously misrepresented. I also agree with her on many points.
People get their backs up about reports saying kisses with granny leading to sexual exploitation when what it is really about is the idea of how and at what age to begin teaching the (very difficult and grown-up) concept of consent to children. Many people leave it quite late simply because it is a tricky subject. The point isn't that children shouldn't kiss granny. That would be nuts. The point is that when you have a child who seriously does not want to give a relative a kiss - for whatever reason (maybe a serious reason or maybe they're just being stroppy!) and is expressing that feeling, you shouldn't stand there and force them to do it because you've just given that child a solid real-life example that their own feelings on the matter of something quite personal do not matter and they should just give in and do what they are asked. The idea of suggesting a high five or wave or something is just one idea of something to offer as an alternative in the moment should it happen - not something that should replace affection with grandmothers or other close relatives.
Perhaps a less volatile example that I have seen would be about a tickle fight with a young child. I'll admit this is how I came across this and it is one that I have adopted. My daughter is only two, but she is already getting the idea that it is her body, so it is her choice. So when there is a tickle fight with anyone - me, her dad, her cousins etc - if she has had enough she is perfectly allowed to say "No more. I don't want to be touched now." I like this example better because it goes both ways - she is also learning that OTHERS have that same right. So when someone else says they don't want to be touched, she has to stop.
E is a bit funny about hugs sometimes - sometimes she just doesn't want to be touched except by someone she knows and trusts (some aunts and uncles okay, others less so - depends how often she sees them mostly). She has a couple little friends that are very huggy and always want to hug and kiss her. Sometimes she's okay with it, sometimes not. I've seen group dynamics at the sure start centre where an uber-huggy girl went to hug and kiss another child who really didn't want it. In order to not upset anyone, the mum of the second child told her son to hug the first child back. He did what he was told, but clearly didn't like it. I confess, that made me uncomfortable. Of course, then my daughter embarrassed everyone by running up and saying "Stop!", getting between them, saying "No!" to the first child and then telling the boy "Your body, your choose" (yes, I actually have said that phrase to her, so yes, she says it too). Honestly, my only problem with her actions was that she pushed the first child and knocked her over - we're still working on that one.