I think that this is correct. Involuntary intoxication might excuse you from violation of other laws or for tort claims, but DUI is simply a strict liability offense. Count me in with the people who say that even if you have never taken a drink in your life, to approach DUI levels you would be asking to go to the hospital if you thought you were just drinking soda and felt a .08 buzz.
As I understand it (I was actually told this in the UK) you are entirely responsible for the vehicle you are driving, and making sure it is road-worthy. Legally speaking, if you drive your brand new RV trailer off the lot and the axle immediate snaps and it plows into a school. Then you are responsible even if you had no idea the RV wasn’t roadworthy and every reason to think it was.
I would imagine (IANAL) the same thing would extend to the driver of the vehicle. You are responsible for knowing whether you are “roadworthy” in terms of drink , drugs or tiredness (and I’m guessing illess). How you came to be drunk/stoned/tired does not matter as far as the law is concerned.