I don't know how that knock off housing flows. A real evo3 housing is definitely bigger than what's on the 20g, but even the real ones require significant porting.
It's pretty easy to tell given the shape of the turbine->o2 flange that the hotside isn't MHI. The fact that the "TURBOCHARGER" badge is on the front means "definitely not a real Evo3"
I'd also note that the MHI Evo3 B16g came with a 7cm^2 hotside, not 8cm^2.