The article mentions that it’s specifically targeted at fentanyl and doesn’t interact with other opioids such as morphine
And fentanyl specifically exists because of the downsides of other opioids such as morphine.
Fentanyl is preferred for cancer patients and end-of-life patients for a reason. Morphine is difficult to administer efficaciously at those levels of suffering, and has some very undesirable side effects (so I've been told. IANA Anesthesiologist).