SPXI ROI is an addendum correcting an over-sharp distinction between SPXI and Generative Engine Optimization.
The parent paper had emphasized that SPXI is not GEO. The addendum states the positive relation: SPXI does not replace GEO returns; it is intended to preserve the entity and references on which GEO performance depends as models and summarization surfaces change.
The document presents a provisional return model. It cites an industry range for GEO, then proposes an additional visibility and maintenance benefit from combining GEO with entity anchoring, disambiguation, and persistent references.
Its figures are explicitly not completed client-study results. The document labels the proposed fifteen-to-thirty-percent lift as a preliminary projection pending ninety- and 180-day data.
The brief’s substantive correction is therefore conceptual rather than empirical: durability and optimization are complementary layers, not competing services.