...I sent this quote to a relative who is Jєωιѕн, and whose morality I trust. This was his reply.
"This is nonsense. Anyone with a computer or a library card can examine the liturgy for Yom Kippur and see that. We ask forgiveness for the promises to God that we have failed to keep. There is nothing about asking forgiveness for harm done to other people because Jews believe that even God cannot forgive that. Only the person you have harmed can."
The Kol Nidre has been exposed since the Middle Ages. Sincere converts like Donin and Pfefferkorn revealed that the Kol Nidre is a denial of FUTURE oaths. The rabbis were challenged, as they were also challenged on the wickedness of their Oral Torah (тαℓмυd and Kabbalistic literature). They had NO answer then; they slunk away from the Disputations.
In the intervening centuries, however, the objectionable texts made available to Gentiles have been sanitized, censored, and code words substituted, so there is no shortage of decoy texts available. The Catholic Church had some role in that, but that is a different discussion.
Keep in mind too that the average "Jew" knows about as much about Judaism as the average "Catholic" knows about Catholicism.
The genuine Kol Nidre is definitely a denial of FUTURE oaths.