Strut Rod Bushings poly vs rubber

I think you're seeing more then there is in the clip, or your monitor is exaterating the curved wide view of the action cam this video was shot with.
Where are you seeing any bending in the strutrod?

The only thing (where I can see some) actually bending are the lips of the K-member where the swaybar is mounted to.
The swaybar bushing itself has some play as well which can be seen by the up&down movements of the bar at times.

The intention of the clip was to simply see if there were some funny/worrying things happening while driving around the block and encounter some speedbumps at some considerable speed. I didn't intent for the strutrod end-nut to be in view, but I'm glad it was.

If the strut was actually bending/flexing as much as you think, it would probably have failed some 6 years already because of metal fatigue when I started using the car as a daily driver.