Soften unvalidated-vs-disproven language to match the measured confound

app.py

@@ -121,8 +121,8 @@ with gr.Blocks(title="Explainable & Auditable Alloy Defect Detection",
 
         **Read the tabs in order** — they are an argument, not a menu.
         The model works and explains itself; that explanation can be hijacked by a
-        meaningless artifact; and once you test the explanation directly it does not
-        hold up. What survives is a statistical guarantee, and that is what we would
+        meaningless artifact; and once you test the explanation directly it cannot be
+        confirmed. What survives is a statistical guarantee, and that is what we would
         actually hand an auditor.
         """
     )
@@ -169,7 +169,8 @@ with gr.Blocks(title="Explainable & Auditable Alloy Defect Detection",
             of **random** pixels.
 
             A faithful explanation should collapse faster when you remove the evidence
-            it pointed at. This one did the opposite: deleting the top 30% of
+            it pointed at. This one did the opposite — which leaves it **unvalidated,
+            not disproven**: deleting the top 30% of
             Grad-CAM-ranked pixels cost only **0.546** of predicted probability, while
             deleting a random 30% cost **0.718**.
             """
@@ -181,8 +182,8 @@ with gr.Blocks(title="Explainable & Auditable Alloy Defect Detection",
         )
         gr.Markdown(
             """
-            **Be precise about what failed.** Grad-CAM produced the heatmap; the course's
-            deletion test then showed that heatmap could not be relied on for this model.
+            **Be precise about what happened.** Grad-CAM produced the heatmap; the course's
+            deletion test then failed to confirm it for this model.
             The *attribution* fell short — the *audit* worked exactly as designed,
             catching something that 98% accuracy, the per-class breakdown and a
             convincing-looking overlay all missed. A diagnostic that only ever confirms