I have a theory.
According to the data from FCS, the part the make The reawakened friendly to the player is from a dialogue "Ashland Leader sees neutral/enemy" under dialogue_package "Ashland Leaders" that ashland leader like rhinobot use, which trigger when the speaker is under the faction "The Reawakened" when the world state is "player kill cat-lon = 1". However the four ashland leader are ACTUALLY UNDER THE FACTION "SECOND EMPIRE" so they are unable to trigger the dialogue thus no become friend with The reawakened. Also, for some reason with Cat-lon die and the four ash dome switch to the The reawakened version, the four ashland leader didn't spawn so there are no one to trigger the dialogue even if the dialogue did work.

I suspect thing are the same at Cat-lon side as well as Cat-lon is under the faction "Second Empire Exile" not "Third Empire".

There, I am not a modder, my knowledge about kenshi modding are extremely limited and I am more than happy to admit I am wrong if someone tell me the correct answer.

Hypothesis: If I change to condition so the dialogue's speaker is Second Empire and I keep one of the four ashland leader loaded when Cat-lon die, or If I add one npc from the The reawakened faction that use the ashland leader Dialogue_package, I would be able to trigger the dialogue and become friend with The reawakened.

Tl;dr: No one are able to trigger the event require to make friend with The reawakened after the murder of Cat-lon,

Result: I summoned enough motivation and fired up FCS again.
I deleted the faction check of the dialogue as probably only the ashland leader use the "Ashland Leaders" dialogue_package so it wouldn't change much. Also sending Cat-lon 6 feets under are enough check for its purpose.

I started the game again and loaded the save which one of my guy stand hidden near rhinobot to keep him loaded, and the dialogue successfully launched and get the relation plus.

I then add 200 relation to the The awakened as the effect of the dialogue to properly reflect the correct? effect of it. I also increase the relation increase of the other guy from 150 to 200 because ♥♥♥♥ it I am the guy who end their thousand years civil war.

I am now friend with Hydraulic knight, Old Empire Police, The reawakened and Second Empire.

I call this a win.

I haven't played Kenshi or UWE in forever so I was wondering if people had or are still having the same problem I did. I'm not sure if the Dev of the mod still works on this or not or checks these posts, but it's unfortunate that the problem still hasn't been fixed after all this time

Confession: maybe I am too quick to judgement.
Later I did found the four leader except Head of Agriculture in their space with the faction The reawakened. It is just too hard to find a specific skeleton in a load of other skeleton when they dress the same. Maybe the real culprit is the "for enemies = false" setting I flick I thought I accidentally changed when I look through the whole thing.

So the real reason is the dialogue required to make friend can not be spoken unless the player are neutral but they are always default enemy....

Thank you for listening to a stupid person.......

This was addressed, for UWE version 30. I appreciate the feedback.