A character's stats in a battle isn't static. Like people always mention Goku vs Superman, and yes Superman would win that fight easily at full power, but Superman isn't wtfomegaversal every moment he fights any waking soul. He can give as much as he can take, but it requires more and more of his full effort to do it, and he rarely is ever going that far until absolutely necessary unlike how versus debating brainrot makes it seem; there can be whole years where he is getting pushed around by less impressive stuff but it actually is giving him some strain. I don't mean just attack power here, there have been tons of fights where he's actually feeling pain from the enemy who clearly doesn't scale to whatever lolversal Superman scales to at his peak It is absolutely reasonable to see an animation of Goku vs Superman, especially in GvS3 where it's shown to be a good spirited sparring contest and not some life or death battle, and assume Goku vs Superman is a fight where Goku pushes Superman more and more until Goku reaches a cliff he simply cannot surmount but Superman easily can. Goku's ceiling passes Superman's floor, but can't reach Superman's ceiling which is far, far above Goku.
ChiefSlayer doesn't have that. Chief's ceiling is nowhere near Doomslayer's floor. Chief doesn't reach a level that would push Doomslayer to reach this cosmic level. It also can't be framed as some good spirited fight, Doomslayer is ultraviolent, angry, and aggressive. He will slaughter Chief.
There's also no curiosity in this fight. It was a shocking twist for some people that Asura, with his blatant feats, actually would lose hard to Kratos who relies on lore scaling. At least in Joker (Persona) vs Giorno (JJBA), Joker might have been far infinitely superior but Giorno's Golden Experience Requiem was such a major roadblock that made people have to spend a few minutes to look for if Joker had something that countered it, which he in fact did, but the effort to find something was still there. Spawn vs Ghostrider was another episode with a clear stat disparity, with Ghost Rider being scaled to omniversal and Infinite Spawn just being infinite multiversal, but there they actually flipped the script and showed Spawn could bypass this stat disparity with his godly level regeneration and ability to survive the penance stare and even do his own.
Furthermore, Chief is the cool calculated one while it's known Doomslayer is a berserkerous blood knight. This dynamic of cool vs berserk is fine in other death battles, like with the Kratos vs Asura animation, because Kratos was the stronger one and ultimately won against Asura's onslaughts, but Chief isn't going to win this.
Also Chief vs Shephard has better animation and thematic potential. Always has since 2016, especially Eternal. Hell, we could have had Broly vs Asura, give Doomslayer to fight Kratos (Both are angry godslayers), that way Broly vs Hulk wasn't so quickly outdated by how Marvel scaled Heralds way above Dragon Ball and Kratos vs Doomslayer is the fight of "Whose lore is better?" which isn't as controversial as making Asura lose.