Well yes as you can read:
it’s ocl-icd that provides it. That’s why I attached the output of
pacman -Qs ocl-icd
So that you can check if these two packages are in your system.
local/lib32-ocl-icd 2.3.2-1
OpenCL ICD Bindings (32-bit)
local/ocl-icd 2.3.2-1
OpenCL ICD Bindings