I have a general positive reaction to Sean's letter above.
But he is a sede, so I don't understand why he mentions the word "Excommunication". Isn't he acknowledging then that Pope Leo XIV retains a type of authority? That is one of the reasons I am not sede: the (sinking) Church could change course, will convert one day, and it will be a pope taking back the reins of power to float the Barque of St. Peter, authentic See, and the four marks of Holy Mother Church declared once more...Ark of Salvation.
Remember the dream of St John Bosco, where he saw the Ship , the Church, anchored to two huge pillars in the middle of a stormy sea, attacked by many smaller boats.
Very short video link, 7 minutes:
TIMESTAMP :6:00 is important.
St Pius X, St John Bosco pray for us.