Uh, you clearly misunderstood things completely. We were/are discussing the 70 years of the Babylonian Captivity. Unless I am gravely mistaken, neither Peter nor John were alive during the period under consideration.
The 70 years of Jeremiah is an end times prophecy and was the subject matter of the 70 Weeks prophecy in Daniel 9.
Those who say that "weeks" are not "years," need to harmonize the two descriptions. Jeremiah uses "years," while the Angel in Daniel uses "weeks," but they must refer to the same thing. How?
In the Israelite religious system, one of the major Feasts is called the "Feast of Weeks." We call the Feast Pentecost. That Feast happens once every year.
So 70 years = 70 Pentecosts. Same amount of time.
And in the true Third Secret, Sr. Lucia says at the end:
"Our Lady told us that this is written, [in] Daniel 9:24-25 and Matthew 21:42-44."
Daniel 9:24-25 is the 70 Weeks prophecy. So her true Third Secret is referring to the 70 year period starting "before 1960." Here is the text again:
Now I am going to reveal the third fragment of the secret; This part is the apostasy in the Church! Our Lady showed us a Church, but this was aChurch of hell, and an individual who I describe as the 'holy Father' leading a multitude that was praising the devil,but there was a difference from a true holy Father, the gaze, this one had the gaze of evil. Then we saw the same Pope entering a Church, after some moments, but there is no way to describe the ugliness of that place, it looked like a gray cement fortress with broken angles and windows similar to eyes; it had a beak in the roof of the building. Next, we raised our eyes to Our Lady whosaid to us: You saw the apostasy in the Church. Because the dogma of the faith is not conserved in Rome, its authority will be removed and delivered to Fatima. The cathedra [or chair] of Rome will be destroyed and a new one built in Fatima. In the kingdom of John Paul II the cornerstone of Peter's tombwill be removed and transferred to Fatima. This letter can be opened by the holy Father, but it must be announced after Pius XII and before 1960. If 69 weeks after this order is announced, Rome continues its abomination, the city will be destroyed. Our Lady told us that this is written, [in] Daniel 9:24-25 and Matthew 21:42-44.(thumbprint)