Ambrose - War can change a man(and a Pope). And, do you have with amnesia? We have been into this before on the forum; you 100% agreed that he approved of rhythm for grave reasons(and you accepted it).
I do not have amnesia, but thanks for your concern about my health.
Regarding the teaching of Pius XII, yes, I agreed that he taught the lawful use of the sterile times for grave reasons. This is a matter of public record, so anyone with the ability to read, and access to his teaching will agree on what he taught.
That is not the same as saying in a vague manner that he taught birth control, as you implied.