Except, CoH fiction was with-in the scope of actually used equipment. CoH fictions were mostly presented in the abilities\capabilities of the authentic units.
Having fictional grenades or stylised fictional ability on the unit\commander is not the same as having completely fictional tank\unit.
It's splitting hairs at this point, but slapping a real name on a unit does not equal authenticity either. Of course concessions have to be made to gameplay, but authenticity (at least for me) means, that what I see in the game could have occurred that way. This doesn't mean that every unit is as realistic as possible, but at least the general "ranking" of units and their main features, strengths and weaknesses are represented, which CoH got roughly right in most cases. A Sherman will lose to a Tiger or Panther. LMGs work great on long ranges. Airplanes come in and strafe your units (concession to gameplay here are their 100m turn radius, attack pattern, accuracy etc, but calling in air support and strafing runs to take out positions is realistic), etc etc.
BUT: As in the example of the V1 rocket, it is not authentic at all. Those rockets have not been used that way, they have not interferred in ongoing battles and never had the accuracy to actually hit something smaller than a large town. The model of this weapon in CoH1 is completely fictional, just saying it were a "V1" rocket does not make it authentic, since neither its uses, nor strengths or weaknesses are conveyed in the slightest.
If the main criterium is "has this equipment been used in WW2?", you're not aiming at authenticity either. At this point, it would be fine to use a normal Churchill (hek, even a Sherman) and just slap Black Prince stats on top of it so it can defeat a Panther. I am sure most people would not be fine with that.