Deadline did not report the details of the casting, so it’s unsure whether or not Adam Rayner’s Morgan Edge is perhaps an alternate version of the Supergirl character, or this is just a straight-up recasting.
Morgan Edge started off in DC Comics as a media mogul who owned the Daily Planet but transitioned into a villain.
The description for the character called this Edge a self-made mogul, whose ability to inspire others has led to his success, as well as others demise.
As previously mentioned, this character already existed in the Arrow-verse via Supergirl, and was played by Adrian Pasdar in Season 3.