Sorry correction the bug is /not present/ in miniupnp but in a different implementation of that protocol. But it's a lot different to say "it's a but in a chipset" instead of "a software bug".

Read the security report carefully. This is *not* a bug in "Broadcom chips". It is a bug that exists in an open-source package (miniupnp) that was used by certain vendors for their wireless routers. Please fight the FUD.

Why is this touted as "newly available"? This is not new spectrum, just loosened restrictions on usage. The FCC notice on their web site says that a restriction was removed on indoor use only and increased power is available. I just checked and my consumer-grade wifi router is using 5200MHz right now.