I work for a company that has customers all around the world in general and in China and Taiwan particularly. I have seen all four of the systems you mention and also variations with the family name last. I can't say that I've seen any one more commonly than any other other than to say that I think your first version, LI Shimin, is least common and is normally used when particular attention is being drawn to the family name. Did you notice if other athletes were also listed with the family name in all caps?

I will say that I prefer versions in which the personal name is either concatenated or hyphenated just because the family name last version is common enough that if I were given Li Shi Min I couldn't tell if the family name were Li or Min. A note for those who do not know, Chinese family names are always one syllable, personal names are usually two syllable.