vestigial delete in language spec

[Dan]

TDPL states
------
However, unlike in C++, clear does not dispose of the object’s
own memory and there is no delete operator. (D used to have a
delete operator, but it was deprecated.) You still can free
memory manually if you really, really know what you’re doing by
calling the function GC.free() found in the module core.memory.
------
The language spec has this example from the section on Struct
Postblits:
------
struct S {
   int[] a;    // array is privately owned by this instance
   this(this) {
     a = a.dup;
   }
   ~this() {
     delete a;
   }
}
------
Is the delete call, then per TDPL not necessary? Is it harmful or
harmless?

Also, are there any guidelines for using and interpreting the 
output of
valgrind on a D executable?

Thanks
Dan