Thanks for the quick reply, I appreciate it

I was aware of the misalignment issue but I didn't think it was priority. The injuries from 2 years ago were due to parkour.... I've always been a safe cyclist
I live in the UK, and the cheapest replacement (for now) is the same RD in the photo (Shimano TX31), which are for ~£12. I was hoping it wouldn't be the RD, so I have uploaded a video.

What are your conclusions based on this video? Any other opinions?