Of course UNC football can be judged alongside Notre Dame. The 2 teams play once every 3 years, which is more than UNC plays Clemson or FSU or Syracuse. More to the point, if you are not going to judge yourself against ND, then you might as well acknowledge that you have no real desire to be truly good - being average is fine.
This year at least as much as any year ever, the Coastal is much weaker than the Atlantic. So even wining the coastal will not by itself mean anything. A team could win the Coastal this year and still be only the 4th best in the ACC.
But to get down to all the real issues: this was not an undefeated Irish team. And it has a 1st year HC who entered the game 1-3 as HC. And the game was in Chapel Hill, with UNC having an extra week to prepare. All those things matter in how anyone should assess the results of the contest.
If this team corrects enough of its weaknesses to finish 10-2, will that be a good sign? You bet. Likewise, if this team keeps stumbling around and finishes no better than 7-5 (without having faced either Clemson or a revived FSU), then that is most definitely not an acceptable sign for the 4th year of a coaching era, especially considering the age of the HC.