Gordon B. Hinckley on how Mormons don't drink sodas with caffeine 2011:
Mormon Newsroom in 2012 clarified that caffeine is NOT banned.
BYU starts to sell caffinated sodas in 2017:
Coke still has caffeine in it, did you read the gas lighting Mormon Newsroom press release a few years ago where they basically said that caffeine was OK, only coffee and tea are forbidden?
"Finally, another small correction: Despite what was reported, the Church revelation spelling out health practices (Doctrine and Covenants 89) does not mention the use of caffeine. The Church’s health guidelines prohibit alcoholic drinks, smoking or chewing of tobacco, and “hot drinks” — taught by Church leaders to refer specifically to tea and coffee."