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No. RKE2 uses IPV4 by default. It is possible to dual stack, or run entirely IPV6. If you wanna know how. Heres the link to their documentation: https://docs.rke2.io/networking/basic_network_options?_highlight=ipv6#ipv6-setup

In my case, specifically I haven’t used IPV6. But still I see, all the processes like api server and all are using TCP6. By using netstat command I’ve verified this

The easiest way to verify what you've found is correct, is to just look at the pod ip. Thats a plain giveaway