Yes, the V7b9 chord can be derived from the phrygian dominant mode of the harmonic minor, but we are talking here about the V7alt which is derived from the super locrian mode of the melodic minor…. At least when we use it with its upper extensions (b9,#9,#11,b13) which is the goal in these studies.
If you are enjoying and learning from this course, please consider supporting my work and giving me a hand by contributing a short review to my public “TESTIMONIALS” page: