I can't figure out where you got this information from. Do you have a link indicating it?
Firstly, are you suggesting that there was some secret evidence regarding this call that Nel &/or Roux didn't want made public? Seriously?
When Roux was questioning Stipp regarding call timings, not once did he even hint that there was contradictory evidence regarding the 10111 call. He talked exclusively about the security log, and Stipp's 2 calls...at 3:15 and 3:27. And the list of objective evidence relied on in the defence heads does not include any "secret" not for public consumption evidence.
There was an Annexure A not released with the heads and the summary of what it contains says nothing whatsoever about 10111. It is all about the 2 calls to security.
And actually, it does show how dishonest Roux actually was.
Annexure A will prove, it says, that Dr Stipp was lying about hearing "help, help, help" after 3:27 and seeing Pistorius in the bathroom at 3:30 as clever Roux can prove he was at OP's house then.
Which is quite unbelievable, actually, as Dr Stipp NEVER gave those times in his evidence....he talked about first and second calls without knowing what times they actually happened.
So absurd.
And these are actual serious submissions
ETA - this sort of "ambush' of the witness is improper.
The witness should be confronted with the exhibit, so that he can address the point of why did he dial security from OPs house and what was the nature of the call.
As a question of evidence, it is not proper for Roux to rely on this point without saying to Dr Stipp "but hang on a minute - when you made this call you were already at OPs house"
This gives Stipp the opportunity to say "i didn't make any such call"