If a bishop's life was so scrutinized like people do with Abp. Thuc, we would have some terrible doubts about the validity of a lot of clerics ordained or consecrated before the 1960s.
Some folks here need to understand the difference between positive and negative doubt.
Who ordained Cardinal Lienart? Was he of sound mind? Was this man interviewed? Do we have witnesses? Maybe Abp. Lefebvre was not really a priest, let alone a bishop. It goes on and on...