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Do the party members really matter though? It's the general public that need to be convinced if he is to achieve anything.
This https://www.politicshome.com/news/uk/politics/opinion-polls/news/77380/poll-theresa-may-has-big-lead-over-jeremy-corbyn (a bit of a poor article in terms of details of the surveys but the first thing that came up with a quick google) suggest that he is behind May but also "Mr Corbyn also narrowly trailed leadership rivals Owen Smith and Angela Eagle on who was more likely to win a general election."
aggi-
It's a bad rewrite of this: http://www.independent.co.uk/news/uk/politics/poll-second-eu-referendum-brexit-theresa-may-general-election-voters-a7140721.html
Politicshome was owned by Lord Ashcroft until 2011, I expect the editorial to retain at least a little bias to the right-wing.
Emyr
So tl;dr, despite the PLP's PR campaign, or because of it, Corbyn's support within the party is growing.