Hi Hui,
Provider Kubernetes maintainer here 👋
Yes, that is the correct repo and despite it being 0.x, just like most of the other providers today, it is mature enough to manage k8s resources. There are a good amount of users of the provider in the community.
I would still suggest you do some POC/testing with the provider to ensure that it works well with your use case before using it in production.
Also, please consider joining to Crossplane slack channel to get faster responses :)
Best,
Hasan