I can give other references to show Matthew was originally written in Aramaic if you like.
And there is plenty of scholarly argument that it was written in Greek.
From DA Carson's
Introduction to the New Testament:
- If Matthew depends on Mark (the overwhelming scholarly view), the detailed dependencies (in the Greek) argue strongly that Matthew was written in Greek.
- Many quotations from the OT are unambiguously from the Septuagint, a Greek document. Others are apparently the author's own translations from a Hebrew original. if it had been originally written in Aramaic, we would have expected the author's own Aramaic translations, not a mix of language sources.
- Matthew does not read like "translation" Greek. The Semiticisms are largely restricted to the sayings of Jesus.
- The view that Matthew was written in Aramaic or Hebrew comes first from Papias, but we have only Eusebius's quotation and it's not a clear what he meant.
Or if you prefer a Catholic scholar, how about Raymond Brown's
Introduction to the New Testament, where he notes that "the vast majority of scholars contend that the Gospel we know as Matthew was originally translated in Greek". He notes also that Matthew in many cases polishes Mark's rough Greek, which again argues that Matthew was written in Greek.
To be fair, I'm out of my depth and am only repeating what scholars say - though unless you are doing your own PhD-level research, so are you. But scholars seem pretty uniform in the view that Matthew was written in Greek. Virtually
everything in NT scholarship is subject to competing opinions - after all, scholars are rewarded not for being right but for being clever - so you can certainly find people who argue for Aramaic. But it's a minority opinion.