This is an outdated take that does not reflect the contemporary feelings of the Taiwanese people and at best only describes a facet of KMT party policy. Bear in mind the KMT does not hold a majority in the legislature - they had to form a coalition with a third party to do so - and the president is from the DPP, which explicitly considers Taiwan a sovereign nation and does not buy into the notion that Taiwan is secretly the real China.
With the exception that “take” is technically correct, as the area in question is a remnant of the already existing government which has maintained independence in a cease fire. Both claim the other, but facts still matter. You don’t “retake” an area that was never under your control.
The RoC lost mainland China to the CCP, but the CCP was never the owner of Taiwan.
I think his perspective is: "If the Qing were the Chinese Goverment and they had Taiwan, and the CCP is the Chinese Government does not have Taiwan, so they will be retaking the island".
His conviction speaks to the strength of the CCP narrative that they ARE China though.
Both consider themselves the temporarily embarrassed rightful heir to the centuries old concept of China.
The distinction between take/retake in this scenario is a shallow attempt to peacock your political opinion for everyone to see.