That almost certainly wouldn’t kill you - at least not from the opioid. For a personal anecdote, I’ve stepped on a carfentanil dart at a nature preserve that was not properly disposed of and didn’t die. Given how much stronger carfentanil is, I am skeptical that an insulin syringe needle and the extremely small amount of fentanyl that would be on the tip alone could be enough to kill someone. (That being said, I’m also skeptical of all of the “cop faints from fentanyl powder absorbed through skin” claims too.)