Probably. His emergence was against all odds, yet he became leader of the party most likely to stand as the the one with the most integrity (whatever you think of his politics), and the one most opposed to populism (you could argue that Blair et al, was more reliant on populism).
So. yes, due to the rise of populism in UK politics, Corbyn emerged as the one most likely to oppose it, and the one least likely to exploit it, at that time, and from the list of prospective candidates.
Try this for a read about Corbyn:
https://www.newyorker.com/magazine/2016/05/23/the-astonishing-rise-of-jeremy-corbyn