Interpolation is commonly used to refer to additions to an anicent text, like scripture, which were not originally there. If you want to have a serious discussion about these issues, you are going to have to step up to the plate, to use some vernacular I rather dislike.
https://en.wikipedia.org/wiki/Interpolation_(manuscripts)
The standard terminology used in a given intellectual field, like the study of Biblical manuscripts (which is directly pertinent to your claim Matthew 28:19 is inauthentic) cannot be dismissed as intellectual patois; neither can it be regarded as mere grandiloquence. It may surprise you to note that arguments cannot be won typographically through capitalization; indeed I fear you may well have worn out your shift key needlessly.
I understand you don't like my caps, and I don't like your intellectual patois either. INSERTS can have various methods and manifestations, yes.
Your attempt to argue the inauthenticity of Matthew 28:19 is not credible given your unfamiliarity with the word "interpolation," which represents important domain-specific knowledge when it comes to Biblical history, textual criticism and related disciplines.
It wasn't me, but Conybeare who actually listed the short forms of Eusebius for the Great Commission. Like I said before, this version in Matthew stands out quite oddly for instance comparing to the Lukan version.
Luke 24
45 Then opened he their understanding, that they might understand the scriptures,
46 And said unto them, Thus it is written, and thus it behooved Christ to suffer, and to rise from the dead the third day:
47 And that repentance and remission of sins should be
preached in his name among all nations, beginning at Jerusalem.
48 And ye are witnesses of these things.
49 And, behold, I send the promise of my Father upon you: but tarry ye in the city of Jerusalem, until ye be endued with power from on high.
...and the Acts examples of baptism was similarly IN HIS NAME, the name of Jesus. Four times SPECIFICALLY. Combined, these concepts of preaching AND baptism were both IN THE NAME OF JESUS ONLY and is a direct CONTRADICTION to the Matthean account.
You can demean my scholarship, and you can make fun of me otherwise, but you cannot refute the above, sir.
Consider, the PROMISE OF THE FATHER, is this Holy Spirit you call a SEPARATE PARTNER OF GOD (ousia). Quite out there for a SCHOLAR sir, but then again you have MANY scholars before you who said the same thing.