A) The relevant portions of the rules only apply to the 5 ghz band. 2.4 ghz doesn't have that set of rules. B) The document is not hard and fast rules, it's a

A) The relevant portions of the rules only apply to the 5 ghz band. 2.4 ghz doesn't have that set of rules. B) The document is not hard and fast rules, it's a set of guidelines to ensure that the device cannot operate out of the rules. So, putting the radio controls in a separate unflashable baseband chip would be ensuring that the radio is only operated by authorized software, while the rest of the router is operated by other software.