This is a good thing believe it or not, you've been validated. Something all of us who have been abused need. No it doesn't make the memories go away, it doesn't take away the hurt, tho it helps the healing. I was never told as a child it wasn't my fault.. I really wasn't even talked to other than by two social workers, one who I told what was going on to and he broke my trust. And the other one that I never said a word to because trust was broken...

Being validated helps healing in so many ways, if we all would have gotten this as young children, we probably wouldn't still be dealing with all the hurt, years or decades later.
I hope you have a therapist to help you deal with this new found information and you can now start the journey to healing!