BBM
Exactly!
If he had shot & killed Reeva somewhere else in the house (in the kitchen, for instance), we'd all be discussing the possibility that she'd got up for a late-night snack when OP gunned her down.
In that hypothetical circumstance, if he'd then kept to his current affidavit claim that grabbed his gun from beneath the bed and rushed downstairs to confront the intruder(s) without consulting with his bed partner with whom he'd just spoken moments before yada yada yada...
OP has a history of lying in order to avoid responsibility for his criminal actions (restaurant incident). OP has a historical pattern of consulting with his house guest when he heard noises in the night (Sam Taylor). OP didn't shoot through the door at his washer/dryer when he feared a burglar was in his laundry room (tweet about "recon mode").
OP has already demonstrated that he's a liar, which casts doubt on anything he says, IMO.
He let Fresco take the blame for the restaurant incident so he could avoid legal & criminal trouble, not to mention the risk to his brand sponsorships (his primary source of income).
Now he's trying to blame his fear of a non-existent burglar as his reason for killing Reeva.
Reeva was in the upstairs toilet when he gunned her down. Since he's a documented liar, what else was he going to say except that he feared an intruder or intruders had entered his bathroom & went into the toilet cubicle?
I don't believe him at all.