I could post an entire page of quotes from people who claimed to know what was in the secret. Cardinal Oddi said lots about the Third Secret-most of it speculative. Did he read it? I've read claims that not even Pius XII read it.
On another occasion, Oddi had this to say about the third secret:
At this point let me advance a hypothesis: that the Third Secret of Fatima pre-announces something terrible the Church has done, naturally without meaning to. That because of mistaken interpretations, disobedience, or something similar, the Church has passed through a moment that was too difficult. Nevertheless the secret says that by the year 1960, in spite of the best intentions, the church would have done something whose consequences were very painful, with a tremendous decline in religious practice. And that later, following a great suffering, the Faith would return. Yes, this may be the content of the secret. But if this were true, the fulfillment of the secret has already been observed, for the crisis in the Church is visible to all. And the most alert souls recognized it years ago". Reference
It sounds like pure speculation on his part, to me.
As a rule of thumb regarding the Third Secret, those who knew, didn't talk and those who talked didn't know.
Does Cardinal Ratzinger know?
--
"Cardinal Ratzinger, have you read what is called the Third Secret of Fatima: i.e., the one that Sister Lucia had sent to Pope John XXIII and which the latter did not wish to make known and consigned to the Vatican archives?"
(In reply, Cardinal Ratzinger said)
"Yes, I have read it,"
(which frank response provoked a further question)
"Why has it not been revealed?"
(To this the Cardinal gave the following most instructive reply)
"Because, according to the judgement of the Popes, it adds nothing (literally 'nothing different') to what a Christian must know concerning what derives from Revelation: i.e., a radical call for conversion; the absolute importance of history; the dangers threatening the faith and the life of the Christian, and therefore of the world. And then the importance of the 'novissimi' (the last events at the end of time). If it is not made public - at least for the time being - it is in order to prevent religious prophecy from being mistaken for a quest for the sensational (literally: 'for sensationalism'). But the things contained in this 'Third Secret' correspond to what has been announced in Scripture and has been said again and again in many other Marian apparations, first of all that of Fatima in what is already known of what its message contains. Conversion and penitence are the essential conditions for 'salvation'."
--November 11, 1984 issue of Jesus magazine
Says who?