It's not that bizarre. Taiwan isn't a sovereign country and by the UN standards, which effectively the WHO is agency of, only sovereign states can 'enjoy' membership in the UN; you have to be internationally recognised as an independent country to get membership and as China doesn't recognise Taiwan, the UN doesn't, so neither does the WHO and the reporting on behalf of Taiwan was done by PRC.
This isn't about politics and he isn't a politician though.
And to blatantly lie in the interview too.
It's not right. They're meant to be about saving lives, not playing a political game.