It's not meaningful in terms of elite European football. It's less meaningful than managers having won the championship for example, and no top side would hire a manager because he succeeded in the championship.
I mean the Norwegian League is what, the 25th best league in the world? It's obviously meaningful to some people, but it's not remotely comparable to success of any kind in a top division, let alone reaching the final of Europe's most prestigious cup competition. People do love to beat the trophy drum but a degree of sense needs to be applied to it, Eddie Howe boasts a championship trophy but would anybody claim that makes him a more successful manager than Pochettino?