If she genuinely loves Harry & he’s not just a pawn that’s very positive for their family future at least.
I agree with your post. NPD people see everyone as an object / stepping stone to use to elevate their status.
They target each person then charm them but ultimately devalue and discard.
We have seen MM do this to her husband, ex partner, father, best friends (multiple), business associates, colleagues.
Its her MO - if the PH association doesnt bring the wealth and status she desires or it continues to decline he will be gone.
She will then likely change direction again (ie; producer to access her acting career, chef to develop her post acting career, a prince for Hollywood A list / philantropy) and seek out a mega wealthy politition - so feed her inate grandiosity and delusions.