Ok here's where the confusion may be. My daily TDEE is 2400 calories, so 100 per hour. This is calculated from a number of standard formulas you can look up on the web, which take into account your weight and typical daily activity (say day at the office).
Watching TV I will burn calories at the same rate, so there is no extra calories burned here. At the end of the day it's another 2400 calories. So watching tv for 4 hours does burn 400 calories.
Playing golf for 4 hours, you have the 400 calories (as above). Then there's the calorie burn from playing which I estimate at 500 - 600. I'm not sure if that means you can add the two figures and say that 900-1000 calories were burned in that 4 hour period or if there's some double accounting here.
It's confusing but I'm still sure it doesn't add up to 1500. Most of us would be a lot slimmer if it did.
Not necessarily if they enjoy a few pints, a curry, eat high fat items and late night snacks during the week and between rounds, you could burn bucket loads of calories a day by playing golf but if your shovelling it in at the other end your not going to lose weight or look slimmer!