The report implies at fuel of 1260kg they accepted an instruction to climb to FL100 for another diversion. That scares me.
As good as forecasts can be, weather is unpredictable and can catch the best people out with little notice. They obviously started with a fair chunk of extra fuel.
There comes a point when you have to land and to me the safest action at the 1260kg fuel point would be to fly another approach immediately, declare a mayday as you know you'll be below final reserve, and quickly brief how you plan to fly an approach and it's doubtful you'll be visual at CAT1 minima (not sure of approaches available) but you will continue to land.
That said I'm using hindsight, and unfamiliar with the airfields.