Oomis, turning this issue into “I am mochel them” does not exonerate you from the Lashon Hara (L”H because it was false characterization, and not MSR) you gave so freely about Rav Shach.
I find it very distasteful that you would turn this into a self-righteous “I forgive them, they don’t know better” issue. This does NOT make you sound special and holy, it is simply more snideness.
You did the attacking to a Godol, and the Mechila needs to be asked by you (not to us, of course), not granted by you.