it’s not using the flux/magic home integration, it’s using the broadlink integration. I think the main problem for you is that the light is not unlocked, normally the broadlink integration should tell you but I guess something went wrong. you can easily unlock it by downloading the “Broadlink” application on Android or iOS. Then try to add it to that application and you’ll see that the last step fails. This is ok, the device is now unlocked and home assistant should find it and let you set it up. The broadlink integration is using the python library for broadlink: GitHub - mjg59/python-broadlink: Python module for controlling Broadlink RM2/3 (Pro) remote controls, A1 sensor platforms and SP2/3 smartplugs
You should also be able to access the light bulb straight in there, the home assistant integration is purely making use of this library