Does the Mac mini (2018) support Intel Hyper-Threading?
Hyper-Threading is offered by some models of CPUs in the 2018 Mac Mini. The base-level 3.0 Ghz Core i5 does not offer Hyper-Threading however.

I'm writing this on a 2018 Mac Mini with the 3.2 Ghz Core i7 CPU - and it does indeed display 12 graphs in Activity Monitor indicating that Hyper-Threading is enabled and used.