Apples for apples, it's a red herring.
A prepared EV owner (fully-charged EV) will go further (or at least as far) in dense gridlock than an equivalent ICE vehicle with a full tank of gas.
Yes, the ICE will go further in regular traffic, but in a gridlock with stop and go's, it will have its mpg halved or worse. Especially if for any reason the AC has to be used and the engine is not turned off at every stop.
Yes, a prepared ICE owner with a diesel truck and extra cans of fuel will go further than a distracted EV owner with 50 miles of charge remaining. But the same applies for a prepared EV owner vs an unprepared ICE owner with a nearly empty gas tank. But that's no more apples for apples.
Emergency refueling for stragglers is also no longer as bad as it used to be. Emergency mobile EV chargers are deployed during evacuations the same way emergency gas fill stations are. And the slower "fill-up" on these chargers might still be faster for the limited amount of EVs that will stop there, vs all the unprepared people with ICEs fighting for gas.
EV will become an issue if the evacuation is 300+ miles, but if it is - we're in a whole different heap of trouble.
It's all about being prepared. A savvy craftsman can use various tools. A lousy one will get hurt with gas powered tools as much as with electric ones