Burned 500 calories in 40 minutes according to my HR monitor. How accurate is this?

So practically everyone online claims that hr monitors and smartwatches exaggerate the amount of calories burned during a workout.

Today I did a cardio/weights workout and wanted to burn 500 calories. So I just went on until my HR monitor said I burned 500 calories.

I mostly dit fast paced walking on a treadmill. At 10 minute mark I did 40 clean and jerks with just the bar, at 20 minute mark I did 40 kettlebell swings with 10 kg and at 30 minute mark I did 5 minutes of jump rope.

I'm 31 of age old, 184 cm and weigh 72 kg. My HR monitor is a Wahoo tickr.

Here is the result:

https://i.imgur.com/kuQ9GkB.jpg

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