I usually steer clear of such conversations, but feel compelled to inform you that the website you mentioned is one best avoided. If the spite for anyone who is not a sedevacantist was not enough to make that point clear at the outset, then you should know that “Father” M.E. Morrison (the only “priests” at the site) was ordained in the Old Catholic Church, who separated from the Catholic Church over 150 years ago over the dogma of papal infallibility.
We are not supposed to mention such things, so if I am out of line, then I ask that this post be withdrawn. But if it is Tradition you seek, it would be far safer to stick with the Fraternity, the Institute, or even the Society (which Francis—like him or not—has given full authority to carry out the Sacraments).
Even where Morrison is perfectly correct (and I am quite familiar with the site; he is correct most of the time), his manifest hatred (along with the playground epithets) is utterly un-Christian, let alone un-Catholic.
“Or even the Society (which Francislike him or nothas given full authority to carry out the Sacraments”
I thought that was limited to the “Year of Mercy”. Not that it would stop me from receiving Sacraments at SSPX.
That's interesting because I have never thought of this site as "sedevacantist". Can you provide proof of this as well as the priest's ordination?
I guess it depends what someone means by "Tradition". If that means just liturgical tradition, then yes you can find Tradition in the indult groups.
Now, if one means "Tradition" as in doctrinal Tradition as well as liturgical where Vatican II is condemned as teaching universal error or heresy, then Catholics will not find Tradition in the indult groups because those groups are not allowed to publicly condemn Vatican II.
Sample from the article CMRosary linked to:
During the Protestant Reformation, the Catholic Church was persecuted and the Holy See appointed an apostolic vicar to govern the bishop-less dioceses north of the Rhine and Waal. Protestants occupied most church buildings, and those remaining were confiscated by the government of the Dutch Republic, which favoured the Dutch Reformed Church.[13][not in citation given (See discussion.)]
https://en.wikipedia.org/wiki/Old_Catholic_Church