I think he was talking about the lower bowl and upper deck, which are both as symmetrical as you can get. As opposed to BDS, which has no symmetry anywhere in the stadium.
Just look at an aerial photo of BC's stadium.
IMO, BC' stadium is the "base model" for changes to BDS.
The non-suites side of BC's stadium look nearly identical to BDS East side.
If the BDS lower east bowl was extended all the way around to the West side, it would look identical to BC stadium's lower bowl.
Looking at how the lower bowl extends from the East aide around the North side, you can see how the lower West would be configured in a symmetrical set-up.
I think the Upper West could be setup differently at BDS.