The review compares Model X, a clear SUV, with 2 premium sedans and a merc SUV. Tells us the trim is not good enough at that price tag and that you can feel the road too much - by the way top gear mag says this about the merc "The ride isn’t pillow-soft, so you know there’s a bumpy road beneath".
Then goes on to complain about handling around corners - in an SUV - which the other SUV (the merc) suffers from as well (Duh, its an SUV) - again top gear re merc "But it’s a two-and-a-half tonne car and feels it, especially since the damping – which isn’t adaptive – is soft. Chuck it around bends and it rolls and pitches and generally comes over all calm-down-madam on you."
Complains about autopilot - something not on the other cars, but says regular cruise control works fine.
Praises the supercharger network
And mentions absolutely nothing about the....
Over the air updates
Falcon wing doors
Powered doors and boot
More cargo space than the merc
More range than the merc as standard - which is only ~231 WLTP
Faster charging than the merc
Faster than the merc
Has 50Kw more power than the merc
Actually 50kg lighter than the merc
Can have 7 seats
And finally
Mercedes-Benz has announced that all production of the EQC for 2019 has already been sold.
While you can pick up an X at any time from custom order, stock or second hand.
So yeah, it's not really in the same class