For someone to get electrocuted, the current needs to flow through their body. Electricity always follows the path of least resistance, so there's basically no way to do that from upstairs.

If you attach both terminals of the battery (or a stripped extension wire) that wouldn't do it. Assuming the pole is conductive, the electricity would just go into the screws, into the pole, across to the other screw and out. If the pole isn't conductive it would probably do nothing at all. Maybe the floor is conductive, in which case it would go into the screw, through the floor/ceiling and out the other screw. There's just no way to do it where the electricity flows from a screw, down the pole, into the body of the pole dancer, then somehow back out and up to the battery.

Even if the person who owned the stripper pole wanted to electrocute themselves it would be difficult. Assuming the pole is conductive, if you attached one electrode near the ceiling and one near the floor, the electricity would just flow through the pole. It wouldn't make a detour to go through the body of the pole dancer. You'd basically have to clip one side of the battery to your toe, the other side to the stripper pole, and then grab the pole with your hands. And, even then, it might not do it -- you'd have to have sweaty hands and toes to make the path through your body conductive.

I really hate the movie trope where people can get electrocuted by stepping into a puddle that has something electricity-related in it. It's almost as bad as the trope that you get blasted backwards if you're hit by a bullet / shotgun blast.