It is true. The claim was that the risk of addiction was extremely small. One of the ways this idea was pushed was cherry-picking a study that showed no addiction among 10k burn victims treated with opioids. Minimizing the risk of addiction was also a major component of the guilty plea and fine.
Obviously any reasonable person with a knowledge of opioids could see that these claims were BS, but it's remarkable what motivated reasoning can do, especially when there's profit involved.