Exactly.
Smith claimed he was not a polygamist. ’Spiritual wifery’ was brought into Nauvoo by Young and others, who had contact with a commune type religion where ”Spiritual wifery” was practiced. CoC historians provide historical documentation that Joseph Smith found this idea to be repulsive and he rejected it, causing friction among the Nauvoo era leaders.
Meanwhile, the evidence for an extramarital affair with Fanny Alger exists before Smith’s death. An affair. Not a marriage. Fanny Alger was boarding at the Smith home. We then see in historical accounts that Smith liked to groom very young women, 15, 16, 17 year olds, who either lived in his home as guests or lived very nearby. Never hearing stories of commanded polygamy and flaming swords and the like until the Mormons who followed the advocate of spiritual wifery (Young), are in Utah and using Smith as their example.
Smith introduces the Mormon temple endowment, based on his experience in Freemasonry, but claims of Smith being sealed to multiple women, including sealing women to Smith after his death, are from Young and his followers, and occurred in Utah. Not before.
Of course the current LDS Church is going to continue the stories that Young started. They are like a Ponzi schemer, who will show you whatever you need to see.
My favorite show-me ”evidence” is a picture of a picture of a rock, that is The Actual Seer Stone that Smith used in a hat to translate the BoM. Mormons eat that up, but they are eating air. If it weren’t so tragic, it would be hilarious.