The man can send dreams and thoughts over to the two all willy-nilly. I say that of course he can make up 'memories' that are realistic enough to believe. At this point, I don't even believe that he's French, it's just part of the elaborate back story he's come up with. You've been speaking English for at least a century! Stop "how-you-say"ing all over the place. Merde.
Or at the very least, those memories are real, but him 'accidentally' sending them over is contrived.
'Richard is showing dissent.' "Ah, Mon Dieu! My wolf, I am so sorry that you saw that! Now what were you saying about YOUR problems?"