The Apostles creed was directed to specific people in the church of Jesus Christ of former-day Saints in order to instruct and correct them. So yes, they were official and authoritative -- given by the authorized leaders within the church of Jesus Christ of former-day Saints.
And, at least in the Lds "apostle" Bruce McConkie's mind, the book Mormon Doctrine he wrote was directed to specific Mormon people in the church of Jesus Christ of latter-day Saints in order to instruct and correct them. So yes, at least from a Mormon point of view, it was a FORMAL, OFFICIAL rendering -- approved in its revised version by Spencer W. Kimball, David O. McKay, & Marion G. Romney ... as testified to by Deseret Book publishers...owned by the Mormon church ... in its 2003 published book The Bruce R. McConkie Story: Reflections of a Son, a biography written by his son, Joseph Fielding McConkie...who was a prof @ BYU
See post #75...which, I see, btw, you've ignored.
You & other Mormons may be able to dismiss the original 1958 version of MD as lacking overarching sanction, but that's not so of the 1966 version. And the Mormon church was still republishing Mormon Doctrine as of 1978...and still citing the book for decades to come in teaching adults, teens in the church.
If it was some nasty opinions from which the church leaders wished to steer its grassroots away from, then endorsing the book would have just shown lack of discernment issues at the highest levels of the hierarchy. So your actual dismissal of the book indicts all these Salt Lake City gatekeepers as wholly lacking of discernment.
Bottom line: You still haven't dismissed the response. You attempted, but was an incomplete pass.
I realize that you think your spoutings are TRUTH!; but the rest of us know otherwise.