It's been on that page since 2001. However, a more recently published article states "Note: We plan to support .dev and .app by mid-July 2023".

https://blog.cloudflare.com/a-step-by-step-guide-to-transfer...

However, it's now mid-July 2023 and still says unsupported on my dashboard.

Was worried about this too, but CF released a blog post the other day saying they're aiming for mid-July for .dev and .app support. Going to transfer mine over as soon as they do.