Great video! Except I don't think I agree there are no turbulent forces acting on the UAP. The flag in the UAP video is moving quite a bit (We can see this extremely clearly btw, is the video focused on the ground, not the UAP?).
In your real life example it it shows that the dangling banner of you balloons that imitates streamers is moving a lot.
If we take the banner out, and just look at the weighted object that is holding the balloons in place, it creates the classic V shape of something holding balloons in place. (A)
The UAP (B) has more of a rectangle shape... certainly a strange one.
(C) is what I thought it could be made up of, maybe it's some weird makeshift surveillance drone? And like, under the ballons are cameras on a short tether, creating a taught non moving shape?
That's my best guess at what it could be, if it were balloons I don't see how it would make that shape unless it had streamers, which I think we'd see changing shape in the video.