I am afraid is not informative. This is a man who lies more than he tells the truth. He would lie about this if it suited him.
His answer doesn't show he is innocent either. Just that words that issue through the mouthhole of that man aren't useable for much of anything.
But of course he colluded with Russia. There's plenty of evidence of it. Trump calling for Russia to get Dem emails, for instance, and Putin did. Or Manafort sharing polling data. Or Trump Jr meeting the Russians. And so on.