I'm going with either outdated considering Chrom was ditched in favor of Robin really early on and no RH-rep (
yet a RH rep in Smash Run with a Famitsu quote that insinuates only playable franchises got enemies) or since he apparently worked at Namco may have been a marketting person going off second-hand information. Duck Hunt/Bowser Jr. they were oblivious about since they're 'secret' until after release, Lucina/Dr. Mario we know were originally alts and it's not too much of a stretch to assume the same about Dark Pit hence they'd know nothing about and Chrom's presence in the CGI trailer and even Robin's victory scene could've confused somebody on the outside with a limited look on the game what his status was.
It's also worth noting they said character DLC was definitely happening in the same email they said Lucas was probably going to get cut.