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Low light ISO is just one of them. It gets worse with their other scores. This is why DXOMark results are highly questionable. Sometimes, one wonders if they are purposefully biased.
All their composite scores including the Low Light ISO involve a necessarily subjective weighting formula that by definition will give preference to some metrics over others, in their attempt to represent what they believe to be typical shooting scenarios. Such subjective weighting will always be right for some situations and wrong for others and I generally ignore them myself. However their individual measurements, including SNR, DR, and color depth, have been independently verified by others to within a reasonable margin of error. Those measurements can be used by informed individuals to make decisions about how the sensor will perform for their own shooting needs.