The news being reported is England have won the championship not that Scotland have won a game. Why should Scotland's win get over the fact that England won the entire thing? Allowing England to win the championship? England have beaten all opponents whilst everyone else has floundered. Should they also caveat it with the fact Ireland and Wales ended in a draw. Or any other result that's happened in our favorite? Nope because England one the championship which is what was being reported.
There probably an article somewhere that's the report on the game itself that has a headline suitable for you.
http://m.bbc.co.uk/sport/rugby-union/35756073
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Just to be clear the headline from their article on the match itself was.
Scotland end drought with win over France