Well, as I realised when you sent me that PM, this update, maybe even the entire Dylan route appears to be at least to me all just Dylan's fantasy.
Would certainly explain why Sophia and now Ellie act so completely out of character. Only seems to make sense to Dylan fans. This entire bonus storyline only seems to make sense if you don't include anything we learn about Ellie during the Ellie route, since it's information that Ellie only tells Sophia, so Dylan would have no idea.
EDIT:
The other thing my theory neatly explains is why the sudden appearance of two other characters we've never seen before. Dylan doesn't know Elena, doesn't know Melanie. So in his own mind, he's made up two generic cheerleader characters to fulfill whatever fantasy of his this bonus storyline is meant to be.
Because L&P promised there'd be no new characters. And characters in a fantasy, or a flashback, that don't actually matter to what's happening at the moment: don't actually count. Like the guy Sophia lost her virginity to. Do we actually care about who he is? Likely not.