Why does a VXLAN offer greater VM mobility and availability in plain English! [closed]

I came across this statement

Since VXLAN is a logical L2 layer network running on top of a physical L3 layer network inside the data center, the latter is independent of the former. In other words, no device of the physical network has its configuration dependent on the configuration of any part of the virtual network. This provides the freedom to locate the computing and/or storage nodes belonging to a particular client in any physical segment of the data center network. In turn, this helps to locate those computing/storage resources based on performance and load balancing considerations. This results in greater VM mobility and availability

ISC2 Official CCSP Student Version p 480

As you can see, how does working at Layer 3 – which I assume is IP tunnelling contribute to this flexibility??