@Alex0000 

Thank you for the feedback! As double check some resources, now RE605X V2  supports WPA3, V1 does not yet. But as far as I know there is a plan for to add WPA3 for this model, while there are times that plan could be adjusted, for the latest information about WPA3, it is always recommended to keep an eye on WPA3 compatibility list (will add Range Extender later)

https://www.tp-link.com/wpa3/compatibility/

For WPA3 support, I'd suggest  creating a Feature request thread on Range Extender Feature Request Board, so users who have the same request can comment and vote /thumb-up for it, it helps us organize the feedback and share with our team for evaluation. Thank you.