https://musicbrainz.org/doc/Style/Aliases correctly states,

The sort name should be in the appropriate form for the alias locale, since different languages sort names differently (for example, use kana for Japanese sort names).

However, it proceeds to incorrectly state,

For artists, aliases should follow the normal artist sort name guidelines.

(https://musicbrainz.org/doc/Style/Artist/Sort_Name says sort names should be in Latin script, not the appropriate form for the locale.)