They were formally defined by the term "existing boundaries," which was clear in 1947. It most definitely did not mean the island of Taiwan, a tiny part of the Republic of China at the time.

> TLDR "the constitution does not define the actual territory."

That's not the TLDR of the ruling, and nothing like that appears in the ruling. The TLDR of the ruling is that the court does not have the authority to rule on what the territory of the ROC is.

> Thus, the constitution does not represent the ROC claiming PRC territory.

The constitution clearly defines the existing territory as the borders of the ROC at the time of the passage of the constitution, in 1947. That was explicitly maintained by the ROC government for decades after it lost the civil war. The current ruling party doesn't agree with it, but hasn't changed the constitution or passed any act that eliminates the claim.

>> and legally considers it part of the ROC but under different rules than the "Free Area."

> There is no evidence to back this claim

You're disputing that the ROC formally defines a "Mainland Area," as opposed to recognizing the mainland as belonging to a separate country? This is not even something you can reasonably dispute. They do use that legal fiction.