I’m not a fan of Francis and he may have an alternate motive, but usually less secrecy and more transparency is a good thing.
Opening the Vatican records on this era may reveal some shortcomings, but it also may reveal that Pius was doing more to oppose Naziism/Facism and to protect its victims than has been previously revealed.
It would be interesting to have a look at the Apostolic Bank archives and the case of Roberto Calvi who supposedly hanged himself off the Blackfriar’s Bridge in 1982. The Vatican bank was the main shareholder for Banco Ambrosiano, of which Calvi had been chairman.
Not with this Pope running the show. He hates the Church.