Any article supposedly based on Science needs to have numbers, ie. how “hot” the water is now and how “hot” it was 1 year ago, 10 years ago. etc. Don’t hold your breath, though.
They may mean that the temperature prediction that comes out of one of their models is increasing.
It's a little hard for me to understand how a region of the ocean that includes a gigantic sheet of ice could go much above the equilibrium temperature of a mixture of ice and seawater, but what do I know.