I'm also very sensitive to the sexualization of kids, but keep this in perspective y'all. There are several studios out there that let kids take pole and aerial classes, in fact I can think of five just off the top of my head.
Keep in mind that if a kid wants to grow up to compete at an elite level, that training usually starts younger than 8. I might not push my kid to be an elite athlete because that in and of itself threatens childhood, but that's reality for people with that goal.
Moreover, I see this as exactly identical to training for cheer leading, ballroom dance, rhythmic gymnastics, or modern/hip hop dance. In ALL of those sports, kids learn some kind of sexy moves, especially with modern dance, because it they want to be competitive, they have to know it. It's the 18 and 19 year old dancers who get a lot of the work out there, and there's a certain modern dance style that is marketable and has some of those sexy moves and you can't expect someone to make a living dancing if you don't show them any of those moves until they're 16 out of fear that it will corrupt them. Frankly, this girl's dance was NOT what I would call "sexy style." And if I had done that particular dance she did I would NOT have been ashamed to have an 8 year old in the audience. It did have some movements that could BECOME sensual movement when she's old enough to be aware of that, but this dance was not sexy, it was more demonstrating fundamentals of pole.
As long as the girl isn't out there dancing in strip clubs, if she's performing for these supportive "pole people" crowds, I don't see any harm being done to her.
In these situations, I think we need to remember that we are looking at her performance with an adult understanding that the dancer herself does not have and is not aware of. And I think whenever you have a kid training in a sport that does have some sexual connotations, and all the ones I listed certainly do just as much as pole, what's important is that a kid has good supportive adults in their life who are willing to help their kid grow in understanding of their sport and prepare for the adult world they are entering.
At the end of the day, I wouldn't have a problem with my daughter poling from a young age and as she approaches adulthood incorporating that into discussions about adult sexuality and what sex and being sexy means for responsible and empowered adult women. I would feel like it's my responsibility to show my kid that there is sex and some people with bad attitudes about sex out there. I would rather my kids grow up with sex as a TOTALLY open topic with me rather than trying to shelter them as long as possible.
FWIW, I grew up in a house where I was "protected from sex as long as possible" and it backfired HUGELY into my adult life because no adult ever talked openly with me and I wasn't prepared. I think if you started a kid poling early and they stuck with it as they grew older it would be an amazing tool for teaching about healthy adult sexuality and keeping that topic open with my kids so they know they can come to me first.