Sure, so where’s the lie?

You can find the claim in the headline right at the UN website:

Equally, “developed countries must keep their promises", including support to the Fund for Responding to Loss and Damage and the Green Climate Fund, the Secretary-General continued, noting that the $300 billion pledged to developing countries must be delivered along with concrete steps to mobilize $1.3 trillion a year by 2035.

Poison the well all you want, but when it checks out, it checks out. Enough said.