I think a more accurate analogy would be either a college all star team or a Duke/Kansas/Kentucky playing the Lakers, not St. Pete. And if St. Pete were to win it all this year it would require 6 elimination game upsets, a 15 seed team over seeds 2, 7, 3, 8, 2 and either 1,2,or 10. I know the USA game vs. the USSR was a mammoth upset but I have no idea how big of an upset each of the rest of their Olympic games were.
I'm not arguing that a St. Pete's national championship would be a bigger upset than the Miracle on Ice, but I could see someone making a rational case for it. I guess it all depends on how you weigh different criteria.