Hello Hussein
I have been unable to find any info about this specific statement, and the strange thing is that I cannot find anyone stating anything about it in the Cisco forums either. However, my feeling is that it has to do with VM orchestration, dealing with Layer 4 to Layer 7 services, similar to what is contained in the following Cisco documentation.
Now why it’s stating L4/L6 rather than L7 I’m not sure. I’ll leave this one for @ReneMolenaar to respond to more reliably.
Sorry I couldn’t be more helpful!
Laz