I have a home on 10+ acres of forested land in Josephine county about 20 miles north of this farm. The owner is not being hyperbolic about illegal grow operations.
Just a quick perusal of google satellite imagery shows quite a few operations in the area around seven seeds and the Applegate valley (look for long runs of hoop structures).
It is true that the number of operating illegal grows has recently dropped dramatically since legalization in Oregon (mostly because it is hard to make enough money versus large legal growers).