There also is mixed evidence that Eli Lilly's stock actually went down from the tweet, given it reacted hours after the tweet and never recovered (usually fake news items effecting price will immediately correct back to the previous trading level.)
Several articles I read about it bury this deep in the article, basically alluding to "we'll never actually know why the stock went down." I would imagine their new Alzheimer's drug looming had more to do with it, but idk. It also becomes slightly questionable about if a quant, etc fund would not know the difference between accounts, when you really think about it...it sounds improbable.