Looks like he is accessing his static orion account to login, that is what the error says.
There are 2 things to be noted on your query:
1. You have added AD Groups onto Orion, that AD Group has full admin rights on Orion and the user that you are talking about his AD\user was added to this AD Group - please correct me if I am wrong. (Settings -> All Settings -> Manage Accounts -> Windows Groups - so here you have added that AD Group which has full admin rights to Orion)
2. Looks like his/her individual orion account still exists, delete that from Orion Individual Accounts. (Settings -> All Settings -> Manage Accounts -> Individual Accounts - if you see that user name here select and delete it)
Once you delete the users individual account, ask the user to open the browser again, key in Orion URL and then ask him/her to login.
Hope it helps.
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