Ah, got it.

So I looked a bit and I'm more confused now lol

The error is similar to ones we saw when Apple updated macOS to require Hypervisor.framework (which we rely on) to not work with Macbook Pros without VMCS shadowing / VPRO when trying to run something nested (i.e. ESXi, QEMU, KVM, Hyper-V, VMware Workstation...)... However I'd expect the Xeon in the 2019 Mac Pro to have that. 

Are there any errors in the vmware.log of the VM?