Credit to nande for helping me fix it:
Editing the DefaultEngine.ini file of the project so this is written:
[/Script/LinuxTargetPlatform.LinuxTargetSettings]
-TargetedRHIs=SF_VULKAN_SM5
+TargetedRHIs=SF_VULKAN_SM5
;+TargetedRHIs=SF_VULKAN_SM6
-TargetedRHIs=SF_VULKAN_SM6
DefaultGraphicsRHI=SF_VULKAN_SM5 ;
The "DefaultGraphicsRHI=SF_VULKAN_SM5 ; " is what really matter because SM6 uses extensions that older hardware likely doesn’t have access to.
I use an Nvidia 960m with Nobara 42 on Proprietary driver 570.169, Mesa 25.1.6, Vulkan 1.4.311
Hope that helps out others that were also in my situation 
(also side not, Meta Humans currently doesn’t work on UE 5.6.0 on Linux, it is marked as a known issue, gotta be patient)