It strikes terror (in the sense of _fear_) into the victims there and then all the same, sure. I was talking about whether or not it constitutes _terrorism_, though. I mean, it's terrorism if the purpose is to spread fear in a way that will further some cause, but not every killing is terrorism, right?
Not yet, but considering the sheer amount of guns in his hotel and home plus the explosives I'm willing to bet something motivated him more than mental illness.
He's not just a random crazy person that bought a gun and went on a spree, there was a lot of planning involved, so he's probably a terrorist of some sort.
Deliberately planning mass murder doesn't make you a terrorist, just a mass murderer; terrorism is defined by a very specific kind of motivation that is far from the only motivation for planned mass murder.