Some of it is, some of it isn't; as the article notes, while some of the fraud is lower-grade olive oil, some of it is non-olive seed oils with additives to help it pass for olive oil.
> The problem is when the mix-ins are from North Africa, e.g. from Morocco, which are considered of inferior quality
No, the problem is that the mixins are lower-grade oil (not extra-virgin). While, yes, this oil often comes from North Africa, the origin isn't really the problem, the grade is.
You're right that non-olive oils are also mixed in, sometimes.
I'm pretty sure the provenance is a problem. I don't remember where that certitude comes from. I can try looking it up if you insist - but actually I'd rather I didn't, I'm a little on the busy side right now :0
Some of it is, some of it isn't; as the article notes, while some of the fraud is lower-grade olive oil, some of it is non-olive seed oils with additives to help it pass for olive oil.
> The problem is when the mix-ins are from North Africa, e.g. from Morocco, which are considered of inferior quality
No, the problem is that the mixins are lower-grade oil (not extra-virgin). While, yes, this oil often comes from North Africa, the origin isn't really the problem, the grade is.