What's Circulating on TikTok? Is Tokyo a Target of a Nuclear Attack?!

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A nuclear attack video aimed at Tokyo is circulating on TikTok, saying "it will be exciting to think about it". Who posted it? and for what purpose?
Ref.:
https://twitter.com/Dr_Mo2019/status/1698153143371194569
https://m.163.com/v/video/VMCMLJH24.html?clickfrom=subscribe&spss=adap_pc
https://www.youtube.com/watch?v=g7-yEsTjvow