I didn't see it but my Dad told me his "analysis" was laughable, and so was Danny Murphy's.
Shearer appears to know less about football than many of the posters on here. To be fair to Murphy he's usually not bad, but pundits often build this simplistic narrative which is often a long way from the truth.
United were "brilliant" in the same we that City were "brilliant" when we won 2-0 at Old Trafford in 2008. We, and they, rode huge amounts of luck and showed a bit of grit against a far superior team.