Do they not know that Goetia has Clairvoyance and can see into the Past, Present and Future right?
His entire reason for doing the things he does was because he saw the Alien God coming... in 2018, 3000 years back.
Secondly, how COULD Yhwach know where Goetia is and get there?
Third, if multiple Servants including Quetzalcoatl, Rama and Edmond Dantes couldn't do shit to Goetia, how would Yhwach?
And even IF he got there, does The Almighty work in a place with that has no sense of Past, Present and Future among other things? Because that's what Imaginary Space is.