The article claims that the "distance to empy" (DTE) indicator in ICE cars is somehow magically more accurate than the Guess-o-meters (GOM) typically found in BEV cars.
But, why would it be? The basic problem is exactly the same.
But, whereas BEVs are trying to eek out every last electron from the battery, and start out with something like the equivalent of a three-gallon gas tank when full (e.g., the Focus, the Leaf) most DTE indicators can assume a gallon or two of "reserve" in the tank at all times.
In other words, the "margin of error" for the typical DTE indicator is often nearly the same as the entire fuel level for a GOM. No wonder the typical DTE has an easier time indicating something that always turns out to be true, almost by default.
It's not that DTE indicators are somehow more accurate, it's just that they don't have to attempt to be as precise as the typical GOM. And, in order to be precise at any given moment, the typical GOM has to constantly update its estimate.