Israels own investigations were themselves biased so to use them as a basis to negate the original report would be meaningless. Israel didn't want international scrutiny and as such offered no defense to the allegations made against her. There's no point complaining about something now that she did not want to be a part of back then.
North Korea leader Kim Jong Un hails accord with South as landmark (Reuters)
from the article: Hamas: Goldstone retreat doesn't negate war crimes committed in Gaza