IMHO the letter is not ambiguous.
They are stating that they are not going to supply parts for ‘your’ motorcycle (or a 961 built by the previous firm).
My bet is that any Classic owners will have to give their chassis / engine numbers in order to purchase parts in future.
My only surprise is that Norton even built these Classics. It would have given them a much clearer cut off between the old firm and the new if they’d just not bothered.
But my question now is: how viable are the 20 Classics?
If they did genuinely re-engineer them, I struggle to believe that it was worth doing so for 20 bikes.
So if they did re engineer them, why not build more, and why not sell those re engineered parts to others?
Alternatively, if they did not re engineer them, how can they sell them after raising safety concerns?!
That’s why I asked if any have actually been sold yet.