[electroly]

Your original post said SDK, that's AWS's name for this:

https://aws.amazon.com/sdk-for-net/ https://aws.amazon.com/sdk-for-javascript/ etc.

Not this:

https://aws.amazon.com/cdk/

The person you're replying to was confused because you said "APIs and SDK" which clearly refers to the former, but then this followup post is referring to the latter. You can do everything with the SDK. The CDK is implemented on top of the SDK and cannot do everything.