No. People were calling Jihl "Sephiroth with boobs", and were extremely excited about her design and appearance in promotional materials but she got ruinga-ed after literally only having maybe 15 minutes of screen time in FF13.
My point has nothing to do with who Ardyn reminds you of. What I'm suggesting is that because Nomura did not design him, he will not end up as the game's main villain. Same thing happened with Jihl, she showed up in all the trailers and promotional work leading up to the game in FF13 but she wasn't designed by Nomura and wasn't used as the game's main villain.
I'm just getting a big case of deja vu.