To be fair, what they shouted can only be hearsay as there were no police on the scene for twenty minutes so all we'll know is what witnesses heard. It pissed me off all the racist things as he was clearly english, there was no mistaking the accent, but the way he said "our land" as if not speaking about England I can see why people would make the mistake, but that does not excuse the behaviour or things said.
It definitely does not seem like a psychotic episode to me though as there were two of them and they had several weapons according to witnesses. I do think it was planned and it definitely seemed like a statement attack as like witnesses have said they could have killed several others, they had the chance, but they just waited around for the police and went for them too. But a statement attack doesn't necessarily mean terrorism and the comments he made could just have been the words he happened to chose to try and justify killing someone in front of witnesses, it doesn't necessarily mean that he did it because of those things.
ETA: If that made any sense lol, feel like I just rambled a bit