In a single-object delete expression, the value of the operand of delete may be a null pointer value, a pointer to a non-array object created by a previous new-expression, or a pointer to a subobject representing a base class of such an object. If not, the behavior is undefined.

Which previous new-expression does the rule refer to? Presumably, it shall be a new-expression that allocated an object of non-class type. Hence, the above rule should be that

In a single-object delete expression, the value of the operand of delete may be a null pointer value, a pointer to a non-array object created by a previous new-expression that allocated an object of non-class type, or a pointer to a subobject representing a base class of such an object. If not, the behavior is undefined.

Since we although said "a pointer to a non-array object", however, it is not sufficient, a pointer to an initial element of an array is also considered as "a pointer to a non-array object "