I mean technically, yes none of us "know" how good UC is, if you want 100% certainty anyways. But when you look at kenpom, look at sagarin ratings, watch them play, look at the talent on each team, and the returning players for each team + new recruits getting minutes and look at the betting market having UC somewhere between a 13-15 point favorite tonight I feel it's not a very controversial opinion to think UC is on another level than Nebraska.
Could that be wrong? Sure. But we rarely "know" anything for certain. All we can do is say what is most likely, and most likely, based on all the evidence we have right now, UC is a lot better.
Lucky for you, if you're so confident the market is overvaluing us there is a way to exploit that knowledge. Go get dem moniez yo.