He expended orders of magnitude more effort on the ground campaigning for himself weeks later. Of course, one campaign might have involved him sharing a platform with other political parties (more unacceptable, in Jeremy Corbyn's head, than attending IRA funerals or events run by SWP front groups that fellow leftists pointedly asked him to boycott) and preferably
not use his supposedly pro-EU speeches to dismiss the economic arguments they'd made in favour of staying in the EU. The other involved attend rallies of people that had turned out to deliver him unquestioning applause and adulation.
It's Corbyn's closest ally in the Labour Party who is now suggesting that anyone with the temerity to still think leaving the EU is a bad idea is "on the side of certain corporate elites". That's certainly not following the lead of the membership.
On the Snooper's Charter he abstained, and whipped his party into abstaining. You can't blame anybody but Jeremy Corbyn for that.