Did you read my comment? Because, I explained this already.

'I can't really explain this through text though, so I'll give you a better explanation when I see you this evening.'

While I'm not explicitly saying I know you in real life in the previous sentence, one could certainly make that inference. And then when someone calls me a liar, all I have to say is, "Listen very carefully, I never said I knew ddingus."

The very nature of an implication is that you aren't explicitly saying something, but rather are phrasing it in a way so that another person would be led into thinking something else. That's what Feynman did.