Do you have any proof of this? Of course not. So you slander a pious individual who has given his life for God for over 60 years simply because as a small kid he was conscripted to the army and deserted it on the first opportunity he got. Why not try reading the book for the theological masterpiece that it is.
The “proof” is in his own autobiography. Why don’t you read it?
But apparently Ratzinger’s own words aren’t enough “proof” for some apologists.