well considering how everything just hangs on on the back of the EE tails, they could have had it enabled as well. I don't think they modeled their circuitry exactly like the OEM else they would be so cheap lol
since the normal brake LEDs do operate in parking light mode and for braking, it's possible that the outer ring does that regardless of the pins involved (by just having the outer ring circuit connected to the other LEDs). and I can see that they just use the 6 pins for direct plug n play. the resistors/capacitors are located externally for these replicas so no need for 8 pins in the first place.
and considering your car only has 6 pins to begin with, i don't see why they would have the need to make an 8 pin.