Just FYI... I've had this same sort of noise... And I've had 3 completely difference suspension setups on my car. The second I lowered my Accord I had the noise.
Lowered on Factory (for 2 weeks)
H&R Race on KYB AGX (for a year)
Progress on Koni Yellows, since last summer.
Nothing was "re-used", every part had new top plates, bushings, etc. I've come to the conclusion that it's the lower arms - probably a bushing that has binded or worn out causing the metal on metal clunk. I drive my car on the track - and I always do bolt checks before I hit the track.
Nothings loose.
I've never done a video - but looking at yours... upper arm is hitting the frame / inner fender.