Absolutely laughable. By any reasonable definition of the term, executive experience would include a military command. Indeed, a military command is far better executive experience than most political office or business. Google "executive experience, Presidents" and you will find several listed with references to the military command.
And I disagree. Being able to issue orders in a military command structure is a totally different skill set than that required to garner consensus as is the case in business and government executive positions.
Yes, there "have" been a number of presidents with experience in military command, but other than Washington and Jackson, none of them were particularly "great shakes" as presidents. Zachary Taylor, Ulysses Grant, Dwight Eisenhower and others I may be forgetting were just that, forgettable.