This is the usual standard, yes. The official use of the artist field is “who is this mainly credited to”, which is usually the original artist. There are some rare cases (especially when one remix of other artist’s music is included in the remixer’s album) where the main credit is actually the remixer, and the title’s “X (Y remix)” actually means “this is the remix of the song X by Y”, but they’re rare enough I don’t have any examples for you off the top of my head.