Why so many are arguing with your very true statement, I don't understand. I have never heard anyone refer to fuel in terms of weight, only in gallons. Of course I don't hang around airports either.
Some people would rather argue for the heck of it than bother to do the work to find and post useful information.
Speaking of which, “blancolirio” is generally a good “no nonsense” resource when these incidents happen. His early report was very early, so he didn’t have much info., but, I expect that will change tomorrow.
https://www.youtube.com/watch?v=Z3lXl9yfISM
(Link to his early report / channel.)
Aviation fuel in particular is referenced by weight since the volume changes based on temperature. For all of us living on the ground, the variation isn't much, but for aircraft going up to altitude, the temperature changes the volume significantly. Small aircraft can reference volume (gallons or liters) but any sizeable aircraft will reference weight (pounds or kilograms).
https://gultomaviation.org/2023/02/why-airliners-measure-their-fuel-in-pounds-while-small-ga-airplanes-measure-fuel-in-gallons/
Most individuals outside of aviation wouldn't know (or care) but a news outlet reporting aviation stories would be expected to get it right since the numbers were communicated to them by someone at the airport or the airline. Any "aviation expert" the media outlet calls upon should absolutely know the difference.