Interesting pictures that do not quite tell the whole story as you are painting it Chak…….
If you look at a few more pictures on the net you will clearly see the one you posted has the whole collar askew.
There are quite a few with a straight collar and some degree of sag that is genuinely from the rubber but do not look as bad as the one picture you posted.
However you want to beat it to death, the terminology is NOT defective or broken!
Although the picture you did post would qualify as broken imho yes.
If you look at a few more pictures on the net you will clearly see the one you posted has the whole collar askew.
There are quite a few with a straight collar and some degree of sag that is genuinely from the rubber but do not look as bad as the one picture you posted.
However you want to beat it to death, the terminology is NOT defective or broken!
Although the picture you did post would qualify as broken imho yes.