Why is it a bold assertion? Looks like the Oracle folks just need to submit a PR to the CAPI docs to include a link to their provider which is available now.
It's usually quite hard to find people who don't work at Oracle who speak positively about Oracle Cloud.
We tried to use it at work, it was the second-biggest disaster of a cloud provider we've ever encountered (Huawei is the first). Stuff is just broken so often it's hard to ever feel like you can trust it.
https://github.com/oracle/cluster-api-provider-oci