Curiosly, they only say this to their European customers. It isn't clear that they plan to continue supporting North American customers.
Either way, eventually operations will halt, because existing products will be out of their update commitments.
Headline would be more accurate if it said "is winding down".
Americans get another message that's similar: https://www.oneplus.com/us/adjustment
OnePlus to NA: https://youtu.be/BwmuvqFzfLI?si=98Ae90_vzS-LFBmi&t=92
The headline would be more appropriate if it said "Oppo stops Sales under OnePlus brand"
For the past years OnePlus wasn't much more than a sub-brand for slightly redesigned Oppo devices anyway...