Note: Certain programs at OHCS may have more limiting definitions of a farmworker than that above, such as a requirement of being a citizen or legal permanent resident, or excluding aquaculture work.
This statement is evidence that Oregon's "regular" definition of farmworker does include illegal aliens. Only "certain programs" require actually being here legally.
This would be like saying that when you owe taxes they require a "payment" and in this case the limited definition of "payment" means that the money can't be counterfeit. It's just nonsensical.