Yes. I do consider it to be insignificant.
This story is a prime example of deliberate hype by the media and hysterical environmentalists.
The idea of "largest spill to date" is, of course, based on how large the previous spill was. The previous spill, if the numbers in your link are correct, was slightly under two tank cars worth.
Natural seeps on the North Slope probably dump more oil than this every year.