A terrorist act, IMO, is a act that instills terror into the population.
We see no further violence at the scene of the murder, so IMO, this was a direct attack against the person not an act of terrorism
Now nothing says that this was not a hate crime, but in hate crimes it is assumed that the attack would continue against any person or persons that the perpetrator felt animosity against. That is unless the perpetrator put flight above further actions.
Also nothing says that this crime was because of the victim's race, or religion nor does it say it wasn't.
So everyone can speculate the reason , but until the perpetrator is apprehend and is questioned (assuming they surrender) or evidence is brought forward I see no reason to speculate.
But if it makes you feel good to express yourself go ahead. But count me out.