Father Sherry has been a priest for 13 years. Granted there are others much longer but who are "all these young superiors" of whom you speak.
Speaking only of Father Sherry, he is extremely knowledgeable of the faith and can express/teach it very well.
Seems qualified.
13 years may seem like a long time to you, but not to those of us who have been traditional for 50 years or more.
Total = 19 district superiors
Ordained 2010s = 0
Ordained 2000s = 5 = 26.3%
Ordained 1990s = 9 = 46.4%
Ordained 1980s = 3 = 15.8%
One ordination date is unknown.
I do not know how many SSPX priests are in the SSPX, but I am sure there are at least 19 who were ordained by ABL, who could and should be district superiors.
The only reason I can see to have younger priests in such positions of authority is because they have been indoctrinated new-SSPX.
District of Africa
Superior: Fr. Henry Wuilloud
Ordained 1998
District of Asia
Superior: Fr. Patrick Summers
Ordained 2002
District of Australia
Superior: Fr. John Fullerton
Ordained 1996
District of Austria
Superior: Fr. Stefan Frey
Ordained 1983 by ABL
District of Belgium - Netherlands
Superior: Fr. Patrick Duverger
Ordained 1993
District of Canada
Superior: Fr. Daniel Couture
Ordained 1984 by ABL
District of France
Superior: Fr. Benoît de Jorna
Ordained 1984 by ABL
District of Germany
Superior: Fr. Firmin Udressy
Ordained 2002
District of Great Britain
Superior: Fr. Robert Brucciani
Ordained 2004
District of Italy
Superior: Fr. Ludovico Sentagne
Cannot find one word about him online
District of Mexico - Guatemala
Superior: Fr. Jorge Amozurrutia
Ordained 2000
District of South America
Superior: Fr. Mario Trejo
Ordained 1998
District of Switzerland
Superior: Fr. Pascal Schreiber
ordained 1998
District of United States
Superior: Fr. Jürgen Wegner
Ordained 1991
Autonomous House of Eastern Europe
Superior: Fr. Karl Stehlin
Ordained 1988
Autonomous House of Central America and Caribbean
Superior: Fr. Lawrence Novak
Ordained 1992
Autonomous House of Spain - Portugal
Superior: Fr. Philippe Brunet
Ordained 2003
Autonomous House of Brazil
Superior: Fr. Juan-Maria de Montagut
Ordained 1999
Autonomous House of Ireland
Superior: Fr. Vincente Griego
took up his first assignment as a priest with the Society of St. Pius X in Manila, Philippines, in 1995. Not one word about him or his ordination here:
https://stas.org/en/seminary-professors.
https://fsspx.news/en/news-events/news/general-chapter-sspx-who-are-chapter-members-2-39312https://fsspx.news/en/news-events/news/general-chapter-sspx-who-are-chapter-members-1-39311Auto download :
https://www.google.com/url?sa=t&source=web&rct=j&url=http://www.videomusic.com.au/cormariae/ListofPriests.pdf&ved=2ahUKEwi7wobqq9jqAhUFKqwKHa9IADw4ChAWMAJ6BAgHEAE&usg=AOvVaw0xhqFJbx_IvD4y-0UwO1U9