“I say now, when they [his discourses] are copied and approved by me they are as good Scripture as is couched in this Bible . . . ” (Brigham Young Journal of Discourses, vol. 13, p. 264; see also p. 95).

The Journal of Discourses is not an official publication of The Church of Jesus Christ of Latter-day Saints. It is a compilation of sermons and other materials from the early years of the Church, which were transcribed and then published. It included some doctrinal instruction but also practical teaching, some of which is speculative in nature and some of which is only of historical interest.
LDS. org official statement

I have never yet preached a sermon and sent it out to the children of men, that they may not call Scripture.” (Brigham Young Journal of Discourses, vol. 13, p. 95).

not every statement made by a Church leader, past or present, necessarily constitutes doctrine. It is commonly understood in the Church that a statement made by one leader on a single occasion often represents a personal, though well-considered, opinion, not meant to be official or binding for the whole Church.
The Doctrine of Christ
BY ELDER D. TODD CHRISTOFFERSON
Of the Quorum of the Twelve Apostles general conference 2012

A few question their faith when they find a statement made by a Church leader decades ago that seems incongruent with our doctrine. There is an important principle that governs the doctrine of the Church. The doctrine is taught by all 15 members of the First Presidency and Quorum of the Twelve. It is not hidden in an obscure paragraph of one talk.
Elder Neil L. Anderson, “Trial of Your Faith,” Ensign, (May 4, 2007)

“Now if any of you will deny the plurality of wives, and continue to do so, I promise that you will be damned,” (Journal of Discourses, vol. 3, p. 266).

“The only men who become Gods, even the Sons of God, are those who enter into polygamy,” (Journal of Discourses, vol. 11, p. 269).

“This Church has nothing whatever to do with those practicing polygamy. They are not members of this Church”
President Gordon B. Hinckley, 1998

“.. our father Adam … about whom holy men have written and spoken–He is our Father, and our God, and the only God with whom we have to do. ” (Journal of Discourses, vol. 1, p. 50).

“the Adam-God theory. We denounce that theory and hope that everyone will be cautioned against this and other kinds of false doctrine.”
SPENCER W. KIMBALL
President of the Church 1976

“You see some classes of the human family that are black, uncouth, uncomely, disagreeable and low in their habits, wild, and seemingly deprived of nearly all the blessings of the intelligence that is generally bestowed upon mankind . . . the Lord put a mark upon him, which is the flat nose and black skin.” (Journal of Discourses, vol. 7, p. 290).

“Today, the Church disavows the theories advanced in the past that black skin is a sign of divine disfavor or curse, or that it reflects actions in a premortal life; that mixed-race marriages are a sin; or that blacks or people of any other race or ethnicity are inferior in any way to anyone else. Church leaders today unequivocally condemn all racism, past and present, in any form.”
“Race and the Priesthood”, Gospel Topics, LDS.org (LDS Church)

Brigham Young is on the one hand condemned in all but name as a false prophet who preached false doctrine, and yet on the other is venerated as the second greatest prophet the church ever had, his name still adorns the flag ship university, the pride of the secular arm of the church.
If one thing and one thing alone where to show up the LDS for the confused and befuddled mass of contradictions and self negating doctrines that it is, that thing would be the Prophet Brigham Young, his teachings and his legacy to posterity