It is absolutely irrelevant what is in this file for the players, because it is read at the start of the game and is not used afterwards. If a class is prohibited, then this prohibition is "embedded" in the save file when it is generated, that is, it is important how the checkboxes were set when the save file was generated.
Also, I would like to note that it is preferable to use Alt+click on the hero's face in the list of player heroes to obtain a class, rather than the "h" button (it does not always work).
Thank you for the clarification.
I am not entirely knowledgeable in this matter, and I was guided by my experience playing on early versions of TE.
The Wizard class is definitely allowed in the starting
