I'm not familiar with this eval board. The board that is supported with our latest SDK is the BCM92073X_LE_KIT TAG3 board. Would it be possible to obtain one of these boards from a franchised distributor?
I believe Macnica and Avnet show stock:
If you are just starting a new design, I would suggest doing the development on SDK 2.x with the 20737 based TAG3 board. The 20732 requires a different evaluation board (TAG2) and SDK (SDK 1.x) and is somewhat limited in features supported.