I don't think that can be the case. I'm not entirely familiar with 2nd edition rules but 20 levels is the heck of a lot. I'm pretty sure Mages can cast the highest levels with that.
I think the answer might lay elsewhere. For example, I remember that better and higher level items are generated at a certain "depth" in the dungeon. I remember there is an option to set the depth of the dungeon when you start so it might be that our friend here simply never got low enough to be able to generate said scrolls.
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