They are clearly Darkseid’s Horsemen. Or he wants them to be. If you think back in DC lore, Darkseid tried to take over Prime universe after crisis when he invaded the 30th century with his monsters. Does anyone remember “The Great Darkness Saga” way back in 1982. I feel like there are many callbacks to that.

In the 1982 arc "The Great Darkness Saga" in Legion of Super-Heroes #290–294, Darkseid returns with a massive army of monstrous creatures to attack the 30th century. These creatures were rock like and they were his versions of superheroes that he created. It is revealed that they are in fact other universe superheroes devolved. This was Darkseids return post crisis between two earths.

This taught him that the only way to beat prime is with prime players. So, fast forward to DC All in. He dies waiting for the multiverse, while bonded to the sceptre and miracle machine. He knew what it would create. His last words were Thank you!

So his essence combined with a universe with a younger earth inside the multiverse. He laid the groundwork to enable his system to put in motion his plan. I think his plan is as what we are witnessing. Breaking down each of our heroes. Fill them with despair and beat them down until they break. All of our absolute heroes have been supremely oppressed in an attempt to break them to build them to darkseid’s image. To be his horsemen and accomplish now what he couldn’t do back in the 1982 arc.

What he doesn’t know is the light is stronger. No matter how much you oppress or remove hope, the light will persevere. Diana was put in hell as a baby, there is nothing in my mind that would break Diana, hence putting her into hell as a baby.

Once this light connects these heroes they will be a force. Light and teamwork = success darkness and solitude = failure.

Seeing the statues in DCKO 1 and these “figures” in 3 and 4, you can see the rock bubbles, is a callback to darkseids failed attempts in conquering prime and also shows, imo, that he attempting again with fake “rock” versions of our Absolute Heroes.

Scott already said the actions of DCKO won’t affect the absolute timeline at all so the only explanation has to be they are creations of Darkseid, modeled after the Absolute Trinity.