Well, the feat was mentioned in Jenkins' Inhumans, so they must've fought in 616 too, but other than a simple reference and one flashback panel we get nothing more. Untold tale type of thing.
https://static.comicvine.com/uploads/original/11113/111130881/3321627-inh_06_017.jpg
His name was misspelled and we don't know if he was the Prime Eternal at the time.