It was not, I suspect, in CNN's reporting, as they had this to say:
Pistorius said in his statement that he used the bat to break down the door in an effort to get to Steenkamp to help her.
Botha agreed with the defense contention that, other than the bullet wounds, her body showed no sign of an assault or efforts to defend herself.
http://edition.cnn.com/2013/02/20/world/africa/south-africa-pistorius-case/index.html
Note. Botha on the stand. Presumably under oath. What's the going rate for perjury and perverting the course of justice these days?
The obvious flaw in all this is that if Oscar had whacked her as suggested with a bat, would he not have factored this action into his one-size-fits-all fable of what happened, in order to be able to explain away the awkward bits of Reeva's skull and brain that are going to turn up later on the bat?
Arguing that it was all a clever trick by the prosecution to hold back the bat-on-skull evidence, in order to get Oscar to commit himself to a specific account and then to bring this whole thing up - voilá - at trial is all very well, but if OP did bash her skull in with a bat then he must KNOW that, and he would have manufactured an explanation. Seeing as he's as clever and devious as he's supposed to be.
I agree. The whole point of putting his story in a affidavit is to try to pass that off as the truth with no way to refute it (whether it's really the truth or not). If he caused her injuries other than shooting her (and he would know this if he used the bat), he will know that he has to somehow account for that in his affidavit because if he does not, his entire story is destroyed. If her skull was truly injured beyond the bullet wound (and it would be if a bat was backing against it, there would be contusions), that wipes him because there is no defending that.
You can say the state was willing to hold out information, heck we'll even entertain the notion of actually lying when asked if there were additional injuries, but OP doesn't know that. For all he knows that will come up and he has to somehow account for that. Simply saying he used the bat on the door when she has evidence of contusions on her head isn't going to fly. His lawyers are not dumb. They would not allow something like that to go unexplained.