docs(MODEL_CARD): remove relative improvement claim

Author: yousefkotp

MODEL_CARD.md

@@ -50,8 +50,6 @@ Evaluated on 8 held-out tasks with 5-fold frozen-feature MLP probe, patient-leve
 | IDH Status | EBRAINS | 0.97 | 0.99 | 0.97 |
 | Treatment Response | MBC | 0.58 | 0.68 | 0.48 |
 
-Macro-average improvements over TITAN: +7.37% F1, +5.50% AUC, +7.83% balanced accuracy. Over PRISM: +8.83% F1, +10.70% AUC, +9.78% balanced accuracy.
-
 ## Intended Use
 
 - Computational pathology research.