Is the following quote in conventional lanaguge? DN 1 states the view of nihilist wanderers, as follows:


  Herein, bhikkhus, a certain recluse or a brahmin asserts the following doctrine and view: ‘The self, good sir, has material form;
  it is composed of the four primary elements and originates from father
  and mother. Since this self, good sir, is annihilated and destroyed
  with the breakup of the body and does not exist after death, at this
  point the self is completely annihilated.’ In this way some proclaim
  the annihilation, destruction, and extermination of an existent
  being.


Is the word 'self' used here in conventional language? 

Or does the word 'self' here actually represent a belief in self by those nihilist wanderers? 

If those nihilist wanderers did not believe in 'self' ( and thus used 'conventional language'), why were they not considered to be enlightened?
It appears to me those Brahmins believed in none existence.
It appears they did not believe in kamma and rebirth.
What Buddha taught was the dependent origination.
It is not enough to understand the not self. That has to be realised through dependent origination.