Yeah, it's confusing. It says he "thought" the warning label was an advertising gimic. But it also says the drink is popular, so it's obviously not killing everyone.
Almost sounds like someone put cyanide in it AND a warning label on it. Maybe someone was trying to test it out to see how many people would drink it, anyway. (What a sicko).
Maybe it was for a popular TV show in Taiwan. Cue music - "smile, you're on candid camera" - aaaaaaachhhhhhhh! (Thud)