I agree, it’s a terrible way of doing things. A certain rep said:I don't know. You can't (or at least shouldn't) do impedance interaction in the cab/IR sections since IRs are linear and the impedance interaction is a nonlinear process.
“To get closer, try using the Fender IRs....Currently the 3rd party IRs don't have a variable speaker impedance curve, which can affect the outcome. This is coming in a future update”
I asked a few questions about how this was handled but wasn’t really given a straight answer so not sure if they’ve done something weird. That response seems to make it sound like the included IR’s have some extra interactions on them.