From your link, the message that Taiwan sent to the WHO:
""News sources indicate at least seven atypical pneumonia cases were reported in Wuhan, China". It also said while China's health authorities replied to the media that the cases were believed not to be SARS, "they have been isolated for treatment"."
Furthermore, from the picture: "I would gladly appreciate if you have relevant information to share with us."
So Taiwanese authorities read publicly available news sources about seven atypical pneumonia cases in Wuhan, and because the media reports said the cases were being isolated for treatment, they asked the WHO if they had any additional information.
Unless I'm reading it wrong, this does not mean that Taiwan had any additional knowledge other than what they had read from publicly available information.
""News sources indicate at least seven atypical pneumonia cases were reported in Wuhan, China". It also said while China's health authorities replied to the media that the cases were believed not to be SARS, "they have been isolated for treatment"."
Furthermore, from the picture: "I would gladly appreciate if you have relevant information to share with us."
So Taiwanese authorities read publicly available news sources about seven atypical pneumonia cases in Wuhan, and because the media reports said the cases were being isolated for treatment, they asked the WHO if they had any additional information.
Unless I'm reading it wrong, this does not mean that Taiwan had any additional knowledge other than what they had read from publicly available information.