It definitely does explain why he didn't show up to his shifts - though Prim had pretty much assumed half the people she knew (if not more) had simply been effected by whatever-it-was.

"In that case, right this way." ...It's just me can have a few meanings, but he probably doesn't mean the one that includes recognizing her, just now. "Have you ever been here before?"

There. That should...work. For asking.