CAPsMAN, which stands for Controlled Access Point system Manager, is a centralized management system for wireless networks that is used by MikroTik. It allows you to control multiple MikroTik RouterOS APs (Access Points) from a single device.
Regarding your question, the hAP AC2/3 devices do not support WiFi 6 (802.11ax), as they are designed for the previous generation of Wi-Fi technology (802.11ac). On the other hand, the hAP AX2 is designed to support WiFi 6.
In a network managed by CAPsMAN, you can still use the hAP AX2 to its full potential, including WiFi 6 features, provided that the CAPsMAN version you are running supports managing APs with WiFi 6 capabilities. With the appropriate CAPsMAN configuration, the hAP AX2 should be able to serve WiFi 6 to clients that support it, while the hAP AC2/3 will serve clients with 802.11ac or older Wi-Fi standards.