The statement was "gradual changes towards independence". Are you saying it is not possible for a territory to take any steps that might lead towards independence or make it more likely?
Blatantly taking statements out of context and intentionally misrepresenting them is not appreciated.
They don't have to declare it. They just are independent already.
They control their own borders. They tax their own people. They have their own military. That makes them independent in my book, regardless of whether or not they announce it to the world or not.
The "announcement" part of it just doesn't matter that much.
You can go to a no-man island and declare your own independence and nobody will care about it.
However, a country that interact with other countries, their independence is recognized by both parties.
Further, as Taiwan is so close to mainland, whether geo-politically, or economically, made it detaching links to China infeasible.
Taiwan's independence is de facto recognized by the US and many (most?) other major powers, it's just not recognized de jure because of the PRC's diplomatic policy. For instance, the US basically has an embassy in Taiwan (they just don't call it one), which is staffed by State Department diplomats (who take a leave of absence to work there so they're not technically diplomats when there). It walks like a duck, it talks like a duck, but many have agreed to pretend it's not a duck for reasons.
This stuff isn't as black and white as you seem to think it is.
I'd say that puts it above many countries that might have wide de jure recognition, but limited, ineffective, or largely chilled diplomatic relations, like North Korea.
Declaring isn't the thing that is important.
As I said before, the important part is controlling your own borders, taxing your own people, and having your own military.
That is what makes a country a country. Not things like "declaring" or "recognition".
You either have it by announcing it and other countries recoginize it or you do not have it.
What I see is politicians play the rent-seeking game between China and the U.S.