John,
I've been to St. Clement's website many times, most recently two days ago. Judging from the pictures it does seem "Tridentine," but nowhere on the website (that I can find) do they give a text of the worship service they use, or even a name to it.
And Orthodox Pyrohy, in fact, didn't deny that the Traditional Latin Mass has a history that goes back to the early days of Christianity in Rome. You just said that it doesn't, but it seems historical data disagrees with you. Anyway, I don't disagree that rites develop over time, and it seems that the Roman Rite underwent quite a change sometime between the third/fourth and sixth centuries.
Orthodox Pyrohy,
I did know that the first Christian liturgies in Rome were conducted in Greek and then later switched to Latin. No argument here on that! I'm not so ignorant of basic liturgical history to not be aware of that, or to suppose you were coerced into saying that by "the Greeks."

LOL.
Logos - Alexis