Forgive my ignorance, but what does that mean?
It could mean any number of things. From the get-go, the most obvious is that the title for the Metropolitan of the OCA is "Your Beatitude", not "Your Eminence".
Also though, Met. Evangelos may be used to calling all metropolitans "Your Eminence" since that is the official moniker of a metropolitan in the GOA.
Who knows, but I could see why Fr. John would find it interesting.
"Your Beatitude" is the title given to the head of an autocephalous Church. "Your Eminence" is used for a metropolitan or archbishop who is not the primate of an autocephalous Church.
Since the Ecumenical Patriarchate does not recognize the autocephaly of the OCA, the Greek metropolitan said "Your Eminence." The OCA, in response, put "(sic)" when they posted the letter, as if correcting an error.
I took it as good-natured teasing on both sides.