Incorrect. Neither the SFPT nor the Sino-Japanese Peace Treaty ceded “Formosa and the Pescadores” to China.
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S-J PT:Article 4
It is recognised that all treaties, conventions, and agreements concluded before 9 December 1941 between Japan and China have become null and void as a consequence of the war.
What does this mean to you? I hope you are not going to interpret it arbitrarily to include what you want and to not include what you don’t want.
In any case, you disputing this is inconsequential. Any dispute about the contents of the S-J PT (for instance, whether nullifying and voiding the Treaty of Shimoneseki included the retrocession of Taiwan and Penghu) would be a matter between Japan and China. Japan has never had a problem with the S-J PT.