I have a 1950X Threadripper with 16 cores and even if I set the thread count to 16 manually in the performance section, it still only uses 1 core. Have Cycles renderer selected and both user preferences and the rendering properties are set to use CPU. Am I missing something?
Thanks for the comments! Figured it out:
I used BPSRender which is the root tool of the youtube video posted above. However it didn't work out of the box; needed to add blender to the system path in Windows for it to work.