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an election by the numbers they did
First, the numbers from 2017
https://www.google.com/amp/s/www.independent.co.uk/news/uk/politics/jeremy-corbyn-election-result-vote-share-increased-1945-clement-attlee-a7781706.html%3famphttps://www.bbc.co.uk/news/election/2017/results
And that was after 2 years of media attacks. Of course 2019 was a worse result but that's after 4 years of attacks.
If you don't think the right wing media attacks whoever is leading the Labour Party at the whim of the Torys and that it effects the election results then there's nothing more I can say.
I wouldn't count losing an election by the numbers they did as huge support.
Vocal support maybe?