Isn't it retrospective to all customers who purchased in the last 2 years? They're not saying a Chromebook bought yesterday gets 10 years but one bought tomorrow only gets 8. They're saying they all end in 2034. If you bought one yesterday expecting 10 years of updates, you got screwed.
Yeah I think you're right.
They're saying that you'll have to switch from ChromeOS to GoogleOS to keep getting updates for the full 10 years.