“Tech Drone Media” is usually quite accurate in his videos. In this video he clearly states that “DJI will release”, NOT “DJI has released” the SDK for the Mini 3. He also correctly points out that SDKv5 for the Mini 3 is not compatible with the SDKv4 used by current drones. Furthermore, he correctly points out that the SDKv5 is only for Android only, not IOS.
It will be a while longer before we see 3rd-party apps for the Mini 3.