The base is original from the producer (chords and melodies), but is complemented with elements that complement the song that come from samplepacks, usually, vocal chops, guitars, wobbles sections, glitch effects. It is the standard in which most of producers work, in a project you will find MIDI files made by the producer, but also melodic loops.
There is Nick Mira's sample has been used as a layer for the main theme of the beat, it is laying underneath 2 omnisphere sounds
Also there's processed guitar sample from Oliver's sample pack
Sample pack Oliver Power Tools Sample Pack II
Loop name OLIVER_guitar_loop_izzy_riff_95_Bmin