I don't think we can define soul by other genres methods of defining soul.
In this case I think Soul applies to techno as identity.
I can hear just as much "Soul" in Chris McCormack's Blacklisted as I do by anything by the detroit boys.
Soul should not be defined by a preordained categorization.
But by the exact meaning of it's essence.
Something you can feel is soul, regardless of the nature of it.