I'm not sure I understand the top row of the table.
93% correctly heard * 86% answered correctly when correctly heard = 79.98% correctly answered overall
96% correctly heard * 84% correctly answered when correctly heard = 80.64% correctly answered overall
So Siri, despite being a bit flaky on answering questions correctly, still wins overall. And it's a bigger advantage to Siri if you only use the un controlled environment...