Wi-Spy Air will certainly display all relevant network information regarding 802.11ax networks that can be found in the beacon. Here is a screenshot of the Wi-Spy Air picking up my 802.11ax network:
Here is some more information that we can glean from the beacon:
In terms of packet analysis on packets that are sent at 802.11ax data rates, Wi-Spy Air is not capable of doing this. This would require an 802.11ax chipset and the only devices that currently have this chipset is latest Samsung phone and iPhone 11, besides enterprise level APs.