This book by Bruce Metzger reveals how and who added glosses and verses to the NT.
The Text of the New Testament: Its Transmission, Corruption, and Restoration
Origen of Alexandria is among those men who made a few identified alterations to some manuscripts, however since we have two 4th century manuscripts that attest to the overall accuracy of the 27 book NT and the Dead Sea Scrolls attest the accuracy of the OT your appeal to a Buddhist site is ludicrous.
What was not added was that Jesus is the son of God, Ezekiel 16:49-50 or any other verse that affects sound doctrine found in the OT. Also if the Bible goes down based on the criteria used by the Essene Buddhist so does the Qur'an.
No original copy of the Qur'an exists. Uthman Ibn Affan, the man who compiled and published the official Qur'an ordered all other written documents of the recitations destroyed. Why?
I asked you for a science site to back up your peg theory, not a Islamic apologist site.