| Nixitur |
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The term "class abilities" doesn't seem to be defined or used in most class descriptions anywhere. However, it seems to be synonymous with "class features" and I have found nothing to contradict that. The section on retraining Archetypes in Ultimate Campaign appears to use them synonymously, too.
Ultimate Campaign wrote:
To gain an archetype that replaces standard class abilities you already have, you must spend 5 days for every alternate class feature you would add, subtract, or replace by taking that archetype.
Since "Spells" is a class feature of the Sorcerer class and describes how you get bonus spell slots, it stands to reason that yes, you would get additional spell slots from being, say, an Ifrit with the Elemental (Fire) bloodline.