Here is part of his interview with the Belfast Telegraph, from your link. I could not respond to the BT here as they evidently wished Corbyn to do.
SN: The question is do you condemn what the IRA did?
JC: Look I condemn what was done by the British Army as well as the other sides as well. What happened in Derry in 1972 was pretty devastating as well.
SN: Do you distinguish between State forces like the British Army and the IRA?
In the matter of killing civilians I do NOT make such a distinction. I condemn all sides who perpetrate such violence. The Belfast Telegraph doesn't. Do you?