And everybody is different.
2500 is average male adult. That does not mean that he, or anybody else, actually uses 2500 calories per day.
Typically people can burn up to around 39 calories per kilogram of weight. Which means the bigger you are the more you burn.
90kg man, with an active lifestyle, would could need around 3900 calories to just maintain his body weight.
If he was a very large person who is overweight then 150 kg is not going to be very abnormal. I know plenty of guys that weigh like that don't look like fat blobs. They are just really big. Big frames, very tall, etc.
In that case then needing to consume 5500-6000 calories to maintain weight is not unreasonable. It is high, but not outside the expected range.
