I don’t think your edit is covered by the apple-guide you quoted anyway.
Habits (Stay High) (Oliver Nelson remix)
(saty high) is part of the title while (Oliver Nelson remix) is the only extra title information here, so no need for brackets anyway.
It would be different for an instrumental version of that remix, though as discussed here that would probably be:
Habits (Stay High) (Oliver Nelson remix) (instrumental)
on MusicBrainz, while the apple guidelines would make that
Habits (Stay High) (Oliver Nelson remix) [instrumental]