If it is true that...

The nature considered absolutely abstracts from every existence, though it does not exclude the existence of anything either

and

The nature understood in this way is not a universal notion

Then it must be true that...

The notion of species pertains to human nature according to the existence human nature has in the intellect

If it is true that...

The nature understood in this way is not a universal notion

and

The notion of species pertains to human nature according to the existence human nature has in the intellect

Then it must be true that...

Human nature has in the intellect existence abstracted from all individuals