

Did some digging on this, this one turns out to be a fan made poster by Nuno Sarnadas, source 1, source 2.

Indeed its a Fan Made Poster...
Looking at the Cast and Plot... i think that ROMULUS may end up being a Working Title, and it could likely CHANGE.... even if NOT i cant see the Movie having any Connections to the Romulus Mythos.
R.I.P Sox 01/01/2006 - 11/10/2017

I wonder if they would use Romulus in any meaningful way, is it the name of the ship? the name of the planet?

Fan art, but still a great piece of artwork. I’m quite eager to see the official first poster for Romulus.

Somebody uploaded the poster on the Alien Romulus imdb page and that got folks thinking its official. Nuno pointed it out on his twitter/x page and it was removed.
I recall a similar thing happened with the now cancelled alien 5, people were uploading fan arts and fan posters to the imdb page it was crazy.