When we ask people with a substance misuse disorder who use opioids what they started on we find, very often, that they started on meds prescribed by a doctor. Those meds may not have been prescribed to them - they may have been prescribed to a neighbour or family member - but they were prescribed.
This is why the massive over-prescription of opioids is a problem. It floods American homes with opioids that people keep "just in case" and that are experimented with by family members or handed out to neighbours to help out.
Opioids may be a good choice for some people with long term pain (I personaly don't think they are), but that would be in a carefully controled setting being closely monitored by a doctor. It's definitely not using opioids that your neighbour has given you for your dodgy back.
The article makes an incoherent point about what is classed as a CPD. Benzos are dangerous (especially in combination with other meds or alcohol) but far fewer people are dying from benzos than from opioids.