"NSA grade" irks me - to think these guys have your best interest at heart. In the 1970's they weakened DES [1]. In 2015 the NSA created a backdoor and pressured companies into installing it [2]. In 2016 you had the leaked tools stolen and used by the Shadow Brokers / Equation Group [3]. More recently the NSA made arguments against double encryption to combat weaknesses in potential quantum-safe encryption algorithms [4].
The point is that "NSA grade" likely means "NSA accessible". The major difference between WPA2 and WPA3 is the individual encryption. My guess would be that there is some backdoor during SAE and they could force a complete reconnect by temporarily jamming/disrupting all users on a network.
[1] https://arstechnica.com/information-technology/2013/09/the-n...
[2] https://twitter.com/matthew_d_green/status/14334701097425182...