TPS and ballooning were as example!
Just I mean, memory management is different between ESXi and guest OSes.ESXi using advanced memory sharing techniques.
Memory is consumed to your guest OS and guest OS has access to all memory addresses (In its opinion). But host used memory percent is the virtual machine memory capacity that it's using from physical memory.
Try to reserve all your VM's memory, then the values will be different with the current values.