Watch him talk about the UN report for the whole 5 days. It's not that the report is not important and is not deserving of mention and discussion. But this is basically Corbyn stuck on 1 gear, the one that is about inequality and the poor. He's out of his comfort zone talking about anything else or having a clear and coherent position about other important political matters. Or he's entirely disinterested, who knows.
Ironically, Brexit will lead to a recession by even the most optimistic govt estimates. The effects of which are always felt the most by the most vulnerable. Yet he's still failing to form a clear alternative position as a leader of the opposition party. The most opposition May is facing is from the backbenchers in her own party, the DUP, the Lib Dems and the SNP. While Corbyn's Labour appears essentially indifferent, unlike their voting base.