I agree he got bribed young people voting. But what about all the people who normally vote labour but wouldn't under Corbyn? And people (like me) who would have voted lib dem but didn't want that to strengthen Corbyn, even though I don't like may either.
You are statistically irrelevant. He lost an absolute fraction of what he gained. Look at it this way, if you lost a tenner and found a hundred quid would you consider it an overall loss or gain? You're the tenner except Corbyn didn't find a hundred quid, he found ten grand. In his own personal constituency he went from under 30,000 votes to over 40,000. Quite a few more votes than TM, in a smaller constituency. He trounced her.
Losing a few 'new Labour' supporters is absolutely nothing to boohoo about in the face of the gains he's had. And the gains he's had are not likely to be anything compared to the gains he is almost certainly likely to achieve now that so many in his party are admitting their mistake for not supporting him, so many in the public are admitting their mistake in not supporting him, the press are realising they can't treat him like a joke anymore, the youth are learning that if they come out en mass they can make a difference. And while all this sinks in TM, or whoever replaces her, have a lame duck government propped up by 10 racist, misogynist, homophobe terrorists and will have to negotiate a Brexit with an EU that have just spunked their collective pants in glee at the state of your government and their vastly reduced bargaining power (of which they had very little to begin with).
Corbyn could literally not have done better. He and his stalwarts are the only British winners today. (The EU has also won, and won big time.) They have made great gains while swerving the absolute poisoned chalice that is Brexit negotiations. And they now get to sit with real strength and stability, smelling of roses, while the Conservatives will be able to do little more than bend over in the face of an EU that has solidified it's own unity in the last 6 months.