In common usage, yeah. He was clearly incensed by what had recently transpired and was incredibly sloppy.

In legal terms, this might well meet the definition of premeditation, as the article said. Grabbing a murder weapon, carrying it with you to meet your victim, and driving them to another location to carry out the murder probably more than meets the definition. He was clearly sloppy, and it certainly seems possible that he was wishy-washy to an extent (possibly hoping to talk things out with Lee somehow) but I don't think those things matter too much legally.

I am, if it's not blindingly clear, not a lawyer.