I agree that level of bonus for data entry smells funny.
Although, the one exception could be some kind of government or hospital data where it cannot be exported out of the country, and therefore the only option is to pay local wages. Even then though, the bonus does sound bogus
Here in The Netherlands, it's very hard to sack people. For that reason you don't see the kind of salaries that you do in the US. An employer has less insentive to offer massive salaries, because with the massive salary comes an even bigger liability.
There's no way he's earning 250k a year in a data entry position. Or even as a developer.
Additionally, I've read nothing on the biggest dutch-language IT/Developers community. I can't believe that someone would boast about this on reddit and not on tweakers :)
Although, the one exception could be some kind of government or hospital data where it cannot be exported out of the country, and therefore the only option is to pay local wages. Even then though, the bonus does sound bogus