I absolutely would not assume that. Only Illinois owners were notified because they are the only ones it applies to according to VW. That obviously leaves a ton of gray area and it doesn't make much sense.
I was only referring to the technical aspect of safely using an occasional tank of B11 or B20. You are correct however regarding Volkswagen's stance on it. This is their nuanced response to my question about what to do when travelling through Illinois:
Fueling your Clean Diesel Jetta should be carefree, and I appreciate you reaching out to us inquiring about the biodiesel letter we sent to Illinois residents. This particular letter you are referring to is targeted for registered owners in the state of Illinois and is only applicable to these customers.
Your Jetta is currently approved to run on a B5 blend of bio-diesel. We realize that individual states are increasing their approved bio-diesel concentrations, and I regret this is making it difficult for some customers to locate a labeled bio-diesel blend of 5%. You can locate biodiesel fuel stations and their concentrations here:
http://www.nearbio.com/. Please know we are currently researching the use of higher blends in our vehicles.
We stand behind our products and our customers, and we understand this is a delicate situation. Please be assured, Volkswagen will do everything possible to work with you should a repair need arise. For your reference, I have attached to this email a copy of Volkswagen’s Biodiesel Statement along with a biodiesel brochure. I hope you find this information helpful.
We recognize the many years you have devoted to our brand, and we appreciate you as a loyal member of our Volkswagen family. If I can be of further assistance, you are welcome to reply to this email.