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If you press F12 and look into network tab, you can actually find the exact api that is called to get response on the UI.
Here : https://us.nintex.io/workflows/v2/instances/{instanceId}/activity (not listed in API documentation) is called which gets you the Task History section as well. Only problem is that it has added security to get tasks history only if the user token is passed. If you if App token in authorization header, it won't give you the past information.
Please refer the Image 1 which located on the right-side. 🙇‍♂️