Hmm … looks like Vulkan SM5 had a 5.5.4 hotfix for SM5 Lumen but DX11 SM5???
UE-235102 Android Vulkan SM5 Lumen ray tracing does not function as expected
Still no Cvar supported for DX11. Vulkan SM5 is still functional while DX11 is still broken for SWRT as of UE5.5.4 hotfix.
Vulkan SM5
DX11 SM5
Restore DX11 SM5 SWRT Lumen by uno1982 · Pull Request #12992 · EpicGames/UnrealEngine
PR Opened against release to see if we can actually get movement here. Dev-5.5 had 15 likes and an approval and was simply closed by the bot.