I'm not sure why both of you believe the impostor (mentioned account) is a real government agency without any type of verification. There was no way of knowing if the fool behind the account was a genuine FIOD agent.
I can think of a reason: timing:The account was created 2.5 hours before fiod.nl published this article, and posted about it 6 minutes after publication.
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And why would FIOD create an account just to announce something that was already on blogs and news outlets?
Ask them? Their number is on their website 
Of course, they cannot prove 100% that this account is true. However, due to the proximity of the events, it became difficult to separate the two events.
Another point that should serve as reflection is that, if he was a hater, the probability of him having made more posts on this subject and even on this OP would be high. Or don't you think so?
The account continues to be accessed.