I'm sorry for any confusion, but the information extracts provided do not include the specific article you mentioned (
https://airbyte.com/blog/airbytes-official-api-and-terraform-provider-now-in-open-source). However, based on the available extracts, it's clear that Airbyte provides two types of APIs: the Airbyte API and the Configuration API. The Airbyte API is a reliable, easy-to-use interface for programmatically controlling the Airbyte platform and is available to all Cloud users. It enables users to control Airbyte programmatically and use it with orchestration tools like Airflow. You can learn more about it [here](
https://docs.airbyte.com/api-documentation). The Configuration API, on the other hand, is an internal Airbyte API designed for communications between different Airbyte components. It's primarily used by OSS users to configure their own Self-Hosted Airbyte deployment and by the Airbyte Engineering team to configure Airbyte Cloud. However, it's important to note that Airbyte does not have active commitments to support this API long-term, and it may be modified in the future if the need arises. You can read more about it [here](
https://docs.airbyte.com/api-documentation). For more specific information about the availability of the Airbyte API for Open Source users, I would recommend reaching out to the Airbyte team directly or checking their official documentation and updates.