He's very knowledgeable and far from a "troll," but to say boxing isn't an endurance sport? In a way I can see his side as it is more or less about skill, but anyone who has actually boxed knows that endurance is pivotal. I'm sure he wasn't dismissing that.
I can see that a lot of you are missing the point: yes, endurance is useful in boxing (like in all other sports), but it is not primarily an endurance sport. Your goal is not to go 15 rounds in boxing, unlike a marathon. You wouldn't even last 15 rounds if you don't know HOW to box. If you lack strength and skill compared to your opponent, then you will require more endurance. But endurance is not the most important trait and boxing is NOT an endurance sport,
this is based on the goals of a boxing match (knock out).
When training, boxers would benefit most from focusing on strength and joint prep. The boxing training itself will take care of specific endurance. If you want to insert supplemental conditioning, use varied, complex movement forms. Running for 45 minutes is not particularly helpful to boxers, it doesn't mimic the conditions in the ring enough. Supplemental conditioning can help, but at the end of the day, in sports, the only activity that is specific is the activity you are training for (boxing in this case).
There is always a component of endurance, even in something like a 100m sprint, but different activities require different kinds of endurance. This doesn't mean that every athlete should be running 5k's or marathons to improve 'endurance'.