With regard to the fitting of this "harmonic damper" or "balance weight" as Audi refer to it, it has nothing to do with the knocking noise or "rolling log" noise experienced by many owners, particularly on earlier MK7's as that noise originated from the original Sachs shock absorber issue that I have detailed many times on the forum and on my website www.vwgolfmk7problems.uk. That noise came from the shock absorber piston rod having too much play in the barrel. This noise was proven by changing to the Bilstein B4 dampers or indeed any other suitable replacements. In 2015 I discovered the issue and switched to Bilstein and I had no further issues with a knocking noise. In 2018 I purchased a MK7.5 GTI and not surprisingly the knocking noise was also apparent to some extent on that model. After changing to a pair of Koni Active's the problem was eliminated.
I spoke too soon!
2k miles since fitting the Bilsteins and the rumbling sound has gradually returned. I can only assume that gradual slight wear must take place in the seals etc.