Nah he knew, but according to his brother, he is an old hippy who does not believe in any nationality except 'earthling', and hence never bothered to change it. (And, as brought up before, he had no reason to, until suddenly a new law was passed 40 years after he served his sentence)
But regardless of forfeiture or ne bis in idem, I think he had a good case on humanitarian grounds, and I cannot understand a judge not taking his bipolar disorder into account.
Because it is indeed more than likely that, when cut off from his social network, in an alien environment, he will relapse into either bad depression, or mania. Especially considering that he's gonna be sent to the Salvation Army for support once he gets here (which is not much more than a place to sleep for the night if you're in time before it's full, a cup of coffee in the morning, and then out to the streets you go until it reopens in the evening). The Canadian judge ruled that 'Social networks in the Netherlands are sufficient'.
Let me tell you, they're not. 30 years of neocon policy saw to that. Perhaps for him they will be, because his case got media attention. But instead of sufficient social networks, he's gonna face bureaucracy, waiting lists for psychiatric help (unless he completely goes bonkers, in which case he'll be admitted to the funny farm), and waiting lists for housing. The increase in 'confused persons' wandering the streets is actually national news, and recurring theme in the public debate over here for a while now
Found a link to an english article:
https://www.cheknews.ca/courtenay-man-deported-monday-284220/