Why is this particularly telling? Surely that would occur in the normal course of a bail hearing - prosecutors are naturally trying to keep him behind bars, and they would need to produce some evidence to do so. It sounds like normal article filler to me.
I'm interested in the whole 'premeditation' part of this case as it pertains to murder. I'm not sure of the legal definition of premeditation, but murder is the intent to kill and as a result of this, someone dies. But intent to kill can still be a spur of the moment thing can't it? In other words, a rage that ensues as a consequence of some dispute, and in that rage the person means to kill the victim i.e. you can't be convicted of murder if you just push someone over and they fall and hit their head on the coffee table and die. That would be manslaughter would it not?
So in order to successfully bring a murder charge, the police and prosecutors must be very sure that the perp did intend to kill the victim, not just injure them, when committing the crime. Where the premeditation part comes in I am not sure - if it means the crime was planned, or whether the perp just said to themselves, I'm going to kill this person now, and did. And the prosecutors can prove it, e.g. cutting someones throat is murder, because you would know that that is going to kill your victim.
