Don't you love it when you get a straight answer!
The answer is yes.
To have a total resistance of 2.1Ω, they will have two 4.2Ω coils in the head. The confusion comes from people taking it to mean that it's two 2.1Ω coils in there. I wish vendors/manufacturers would list the resistances as "Total Resistance" with dual coil devices to clear up some of the confusion, but unfortunately, they just list it as "resistance."