Their license page is simply incorrect in many of its assertations.
To the extent that the charts of ability scores do not represent a non-linear mathmatical function (i.e., the figures are arbitrarily made up by the original writer) they're protected by copyright and can't be reused without permission.
To the extent that the class & racial limitations and individual power descriptions and level dependent abilities and game modifiers match those of AD&D (any edition) and are not the result of a simple linear mathematical function, those templates represent selection, arrangement and presentation copyrights inherent in AD&D and suffer the same limitations.
Spell names which are not OGC but are in AD&D and are "not obvious" (i.e. they contain some creative element) are copyright by WotC.
The 'to hit' charts, to the extent that they represent non-linear functions, are protected by WotC copyright.
In summary: I wouldn't touch this without SERIOUS work to ensure everything I used was actually OGC.
Ryan
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