I'm sorry for not being clearer. Yes, I think you got hosed.
That vid, even though it isn't the same lens does not sound like yours. Although not as bad, you should hear my 300 F4. One heck of a racket comes out of it and supposedly it is normal.
2000 740i-Annalisa and 2008 335i-Weebl. Weebl may wobble but has DTC
2012 X5d in Sparkling Bronze ( The Ultimate Cat Carrying Machine)