The issue is that all calorie burning activities are an imposed stress of some sort. Or in other words they cause some sort of tissue damage, the trick is to do them with enough intensity to cause a recovery stimulus and at the same time short enough you can recover from them.
For example, the lower the intensity or should we say the easier it is to do for longer periods the less adaptive recovery you have. This means you lose more than a few calories but the ability to burn them even at rest.
So take this in this way, using cardio in any form to burn calories is counter productive with the exception of a really short term intense loss as needed for special events, ala bodybuilding comp, making a weight class, weddings etc
Now with that said, if you combine the training with something of sufficient intensity and short period that causes a counterbalance to the stresses such as 20x10 tabats style training then you can prevent breakdown and get extra calorie burning from said activity. BUT this depends on your training style, those who do multiple sets over multiple days will overtrain on tabats far faster than say an HIT advocate.
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Oh wait, what was the question again?