http://www.cathinfo.com/catholic.php?a=topic&t=23234&min=40&num=5
According to the Spanish blog, +Williamson never requested for the "lifting" of the excommunications and never signed such a letter.
Na recente entrevista aqui publicada, D. Richard Williamson afirma não ter tido conhecimento do pedido de “levantamento das excomunhões” e que não assinou tal carta.
http://spessantotomas.blogspot.com.br/2013/02/o-meu-testemunho-respeito-de-uma-carta.html
I just listened to the interview in Spanish and he starts to talk about the excommunication at the 49:20 mark. To paraphrase: He says that Bp. Fellay told him that he was going to send a letter to the pope asking for the removal of the excommunication, but that he never sent it to Bp. Williamson to see or to sign. That had he seen the letter and what it said, he would have not signed it, and would have asked for it to be corrected, because it took the excommunications as being legit, when they never were.
He also says that the letter of December 16, he did sign because it said clearly that the excommunications were never legit.
Can someone provide a link to this letter?
PS- I speak Spanish. Bishop Williamson does a good job in his Spanish for an Englishman.