Yamamoto couldn't know just how much Ryuutaro was not interested in spending time with it and it was not like the fortune-teller's behaviour was giving it away.
But at least he could talk about his ability. Really talk about it, not the unsure talks he had at the Manor, knowing he could not prove most of the things.

"Indeed, I did. Mostly before he went through some... inconveniences", which was a really nice way of putting it, "But nothing about his adult life, if you mean that."
Ryuutaro opened his fan, so that it was in front of his face once again.