I would be very surprised if a house builder was bonding & skimming walls.
Noises to ceilings and floors are often generalised, the report from the NHBC concerns a very specific noise. Noises can be clunk's, squeaks, metallic both high pitched and lower, popping ,cracking and micro cracking.
Each of these noises indicate a different fault. Then you look at isolating the noise to an area or joists.
Knowing the construction details of joists, trimmers, steels, noggins etc you make a "guess" as to what the problem is and how to fix it.