False. And don't use the term "Chinese" as it's ambiguous. This is not what the PRC claims.
The ROC has existed since 1912 and has only occupied Taiwan since 1945 (some claim since 1952 and the Treaty of San Francisco). The ROC has been an independent state with continuous diplomatic recognition since 1912. It does not need to declare independence. I just take issue with people calling the ROC "Taiwan" as it gives ammo to PRC shills who intentionally muddy the conversation with their claim that "Taiwan is a part of China" where the term "China" is ambiguous or referencing the "One China" principle which the US doesn't even recognize (acknowledges the existence of, but does not adhere to).
> I just take issue with people calling the ROC "Taiwan" as it gives ammo to PRC shills who intentionally muddy the conversation with their claim that "Taiwan is a part of China"
...Calling it "Republic of China" is straight up saying "[this area] is a part of China". Naming it "Taiwan" is giving it an identity independent of China.
No, the current situation is that there are two governments both claiming to represent "China", not that the ROC is part of what you are calling "China" (PRC). The ROC can't amend its constitution to rename itself without triggering a PRC invasion.
You are using "China" to refer to the PRC which is misleading and muddies the conversation. I'm against calling the PRC "China" as much as I am against calling the ROC "Taiwan". Please use the full name or the acronym to avoid ambiguity.