There is no evidence to support a claim that the BCM4718 is not 802.11n compliant.
Literature produced in 2008 by Broadcom could of course only ever say it is Draft-802.11n compliant.
It is not true that it is necessary for devices produced before the introduction of the 802.11n standard to require hardware or software updates or modifications to conform to the standard.
Nor is there any credible reason to believe that such devices are in any way fundamentally different or inferior to those produced after September 2009.
Literature produced in 2008 by Broadcom could of course only ever say it is Draft-802.11n compliant.
It is not true that it is necessary for devices produced before the introduction of the 802.11n standard to require hardware or software updates or modifications to conform to the standard.
Nor is there any credible reason to believe that such devices are in any way fundamentally different or inferior to those produced after September 2009.