If a car's registration is past due, do the fees apply in another state?

For example: I am in contact with a man in California (where I currently live) about purchasing a vehicle from him (specifically an RV). Later this month, I am moving to Nevada and want to take said RV with me.

I’m not well versed in DMV law though, so I’m not sure what to make of his claims about the RV.

He says the tags were last paid in 2015, in Oregon, but that there aren’t any fees in CA (or Nevada for that matter) because it was never registered there.

Is this accurate? If I purchase this RV and then register it in Nevada, will I be free from back registration fees?