That doesn't mean anything. I'm sure there plenty of examples ere a show deviated from its source in favor of dramatic effect. Because nothing kills a show faster than premature escalation.After all, it was "Flash of Two Worlds" that established the DC multiverse in the first place -- and that was very early in the history of the Silver Age Flash,
But they aren't deviating. They're following the comics. The only question is whether they're following the comics because they want to follow the comics or because there's a Supergirl show on another network. I think, absent evidence to the contrary, it makes sense to me that they're following the comics because Flash is a show that likes the comics a lot.