Can i use Siv64 with Deepcool LS520 SE?

Does the device show up on [ USB Bus ] and if so what is reported? Looking at spams://uk.deepcool.com/products/Cooling/cpuliquidcoolers/LS520-High-Performance-240mm-Liquid-CPU-Cooler-1700-AM5/2022/15857.shtml then it looks like there is no USB connection so it's impossible for any program to directly report/control the pump/fan speeds and/or report the coolant temperature.

I guess you could connect it via a supported fan controller, see Menu->Tools->Link Limits to check what is supported by SIV.