Wrong or incomplete?

The current findings seem consistent with "both plaques and tangles are significant components of the pathology" and "our interventions are typically late and the accumulated neurological damage is already extreme by the time clinical symptoms show".

Attacking the plaques wasn't completely worthless - findings show that this often slows disease progression, especially in early cases. There are pre-symptomatic trials ongoing that may clear the air on whether "intervention is late" is the main culprit in treatment underperformance.