If the re-produced letter is truly from Fr. Voigt, then I don't believe that I would trust him. Why would a priest claim that the source of his ordination is his "personal life"? Frankly, this doesn't sound like a proper attitude of a priest. It sounds more like a person hiding something he believes others wouldn't like. I cannot name an actual traditional Catholic who would object to, say, the ordination by a Society bishop. On the other hand, I know plenty of traditional Catholics who would object to, say, the ordination by an Anglican, Old Catholic, or even an Orthodox bishop (even though the last of these would be unquestionably valid).