Quoting GAON – “I would never rely on any of those, unless written by a reliable Posek or by Rav Chaim himself.”
Getting way off topic for a moment (- but appropriately), this reminded me of the famous story about the Ohr HaChaim Hakodosh, during the time when he went ‘off the grid’ and traveled incognito for the purpose of self-imposed Galus. He was listening to a Rabbi’s drasha on Shabbos, and the Rabbi quoted what he allegedly heard from the Malochim discussing divrei Torah that the Holy R’ Chaim had said that week. R’ Chaim interrupted the Rabbi’s drasha to say “that is not what Chaim said!”. The first time, the Rabbi let the affront to the Holy Ohr Hachaim Hakodosh go by unpunished. But when this interruption from a seemingly rude stranger repeated itself, he had to defend the honor of “R’ Chaim” and had the stranger beaten (for calling him ‘Chaim’). This ended up being the message to R’ Chaim that his atonement was completed and he was able to return home.
My point is, that even R’ Chaim himself is not always believed when he denies (or maybe confirms) that he said something!!