It may suggest that but it's unclear. When he says "it means that a chanter should have a higher charisma than a necromancer" that could mean a number of things.
It could mean, as you suggest, that the chanter would have a lower chance of succesfully rolling on charm/lull/mez checks if the chanter had the same charisma as a necromancer.
But it could also mean that a chanter has much more to gain from having high charisma. As in the enchanter will benefit more from having a high charisma and therefore should have a higher charisma.
I'm not saying it's one way or the other, but just that it's a little vague to draw any hard conclusions based on that quote.
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