Nice attempt to portray it as false news, but when Al Jazeera gives it headlines I think a rational person would accept the story has wings.
If the rest of the world accepts a definition then a dispassionate view would conclude that if labour cannot accept the same definition then the party has a problem with anti semitism.

As wee geogie brown, the former prime minister said:" the issue touched at the soul of the Labour Party and must be dealt with at once.

https://www.aljazeera.com/news/2018/09/uk-labour-party-vote-anti-semitism-definitions-180903161203173.html

If the issue is not resolved the party will self destruct(not that I would lose any sleep over such an event!)