As I read it, Makabeus is a special case--he goes around collecting spells, so in effect, this paragraph is saying "lots of magic which didn't *used* to be Makabeus, and which you wouldn't *think* is Makabeus, actually is, because he found it and he likes it". So ordinates can still only use Makabeus magic, but it just happens that Makabeus magic includes "this really cool spell we saw a dwarf use once, so we raided their mines and stole their notes and faked up a version of it".
As an analogy--an Orlanth disciple can only use Orlanth magic. Well, can he use troll magic like the Sandals of Darkness? Sure. Because Orlanth stole the sandals, so they're Orlanth magic *now*.
Just my guess...
--AMS
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