adding my two cents from Japanese editing, I think it makes sense to add a comma even when the names aren’t necessarily flipped around
like Chinese, Japanese names are surname first, given name second. usually the name will be flipped to the English standard when it’s translated to English, but it is not uncommon to keep the Japanese name order too. for example, Taku Iwasaki here, “Iwasaki” being the surname vs. Tsukumo Sana, “Tsukumo” being the surname
I think standardizing English sort names as Surname, Given Names makes sense, as it clarifies to editors that the sort name is in the proper order and would properly sort artist names in more cases. this also follows the same format as the artist sort name, which actually gives a Hungarian example that’s also Surname, Given
edit: this only applies to English aliases, of course. individual languages have their own sorting rules