If you look at ~0:47, it seems the crack was always pretty large. I’m wondering if the user cracked his lens, then decided “why not try a 3rd party one?” Obviously, he very well might have cracked it trying to take it off, but perhaps not.

Good observations!

I just wonder about the crack in the original lense cover after use of the removal tool.
There was a tiny crack at the right corner before the use, and a crack expands after the removal tool application. You can see it in the video.
So, does the removal tool cracked it, and what happens with upcoming lense removals.
Or the crack just happend while turn and break the original lense clue.