It was common knowledge in 2015:
Excerpt:
Catholic World News
Vatican names Bishop Fellay to hear canonical charge against SSPX priest, despite bishop's suspension
June 04, 2015
Bishop Bernard Fellay, the head(...) Society of St. Pius X (SSPX), reports that he has been appointed by the Vatican as judge in the canonical trial of an SSPX priest.
Bishop Fellay observed that the Congregation for the Doctrine of the Faith, which handles serious accusations against clerics, named him to hear the case although he is suspended from active ministry and the Vatican does not recognize the SSPX. It is “a beautiful contradiction indeed,” he said.
The Vatican’s decision to give Bishop Fellay canonical jurisdiction in the case could also be seen as a sign that the Holy See continues to hope for reconciliation of the SSPX. Archbishop Guido Pozzo, the secretary of the Ecclesia Dei commission, told Vatican Insider: “I see no contradiction here, but rather a step toward reconciliation.”
Fr. Matthew Salenave would know first hand if +F has that faculty from Rome...He was tried by some type of judges from neoSSPX . They used the 1983 Code ie. condemn without proof required.
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And when in
2024 AD. they send a priest to the
Golden Prison, well, isn't that approved by Rome too? Interesting question.
https://www.cathinfo.com/members-only/neosspx-condemns-a-priest-to-golden-prison-july-2024-a-d/msg974017/#msg974017( I could probably find that link / reference if you really need it)
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https://www.cath.ch/newsf/le-vatican-mandate-mgr-fellay-pour-juger-un-pretre-lefebvriste/Vatican mandates Bishop Fellay to judge lefebvrist priest.
AI translation: unofficial
Rome, June 5, 2015 (Apic) The Congregation for the Doctrine of the Faith (CDF) has mandated Bishop Bernard Fellay, Superior of the Schismatic Fraternity St-Pie-X (FSSPX), a trial judge for the trial of a lefebvrist priest accused of serious crime.
Bishop Fellay himself announced the news, during a sermon in California, last May, reports on June 3, 2015 the website “Vatican Insider”. The Valais bishop presented the fact as an example of the Holy See’s “contradictions” regarding his relations with the Separate Brotherhood of Rome since 1988.
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Note Vatican Insider web didn't work for me.
St Pius X, pray for us.