This could be true - the Outlander PHEV doesn't have the third row seats. However, I was under the impression the cargo area is not affected - but I wonder if the cargo floor is slightly higher than the back of the third row seats (when folded down) would be.
The other option is that perhaps 10 cubic feet of cargo space is taken up by this EV charge cord storage area?
Mitsubishi keeps saying the Outlander PHEV components didn't affect the passenger area at all - which now that I type it, perhaps they were specific in saying passenger area and not cargo area?
I think I read somewhere that the rear floor area is raised about 4 cm... I'll have to see if I can find that reference again.