On seeing the pic at #2, I wondered if it was a piece of broken garden fencing. There were a lot of severe gales in the UK in 2020 (and some this year too). After the gales some streets were littered with bits of broken fence and other garden furniture.
A problem with any ‘blowing in the wind’ hypothesis is that in the video a sound is audible in association with the object. It’s quite faint, but unless it is a pure coincidence (or fake) it suggests that the object is powered. The motion also seems too fast ... Read even more
