Probably not, as InsideEVs tests in as close to optimal conditions as they can find. But that isn't really the point in the final analysis. The EPA has always said that its ratings are for the purposes of comparing vehicles and not meant to be a necessarily accurate representation of what any one car will do in real-world conditions.
When driving in the real world and encountering the inevitable variables in weather, terrain, traffic, road surface, etc., you'll be encountering those same things no matter what brand of EV you're driving.
So the real point it this: The Lucid Air starts out with such a wide range advantage over any other EV that, no matter how much the above variables reduce that range, you will still be able to go much further in your Air than in any other EV on the market.
Yes, the Air has a bigger battery pack. Yes, an EV with a heat pump cabin heater (such as a Tesla) might see a little less range loss in cold weather, a driver that does a better job of keeping tires properly inflated will do a bit better than one who doesn't, a propensity for punching the accelerator will exact a bigger penalty in a heavier car (such as the Lucid), and so on . . . . But, when you start out with 60% more nominal range, there is almost nothing you can encounter on the road or you can do with the way you drive the car that will still not leave you with considerably more range than you would have in any other EV that did one thing or another a bit better to enhance range.