Yes, technically the SBLGNT is less than 100 years old.
But it was produced by looking at many ancient Greek texts to try to get back to what the autograph said. There are several critical editions around, I like this one because it is free to download.
But do you believe that the majority of the ancient Greek texts differ substantially for the verse in question?
No, but there is a tradition that first Century Church People were "Oneness."
Tertullian made a famous quote when he introduced his idea of the Trinity, he stated, he was opposed by the
MAJORITY!
So clearly, the Early Church was Trinity how I showed from the Church Fathers or Oneness or Tertullian would not claim he was opposed by the MAJORITY!
^
I said that to also say, the Catholic Catechism claims People till the 4th Century Baptized Jesus Name and then it was changed.
Read last Paragraph:
^
If this is true, the first Church was Baptizing in Name of Jesus, and they changed it in the 4th Century, maybe they changed Matthew 28:19 at that time since they were now Baptizing in the "Titles?"
It's just a guess here.
But clearly from Tertullian and the Catechism, the first Church was not Trinity. So maybe when it became Trinitarian, they changed some things to help the idealism??? Just a guess! I already showed where the Titles were not in the Aramaic, Greek, or Latin Vulgate 1 John 5:6-8 like in the KJV. So maybe they were just helping this new idea along??? Just a Guess!