They state at the very outset that they worked on the data for over a year, doing OCR, analyzing, digesting, cross-referencing, etc. No one is presenting a false front -- they aren't claiming that this is a bunch of files that they got yesterday, and instead are quite up front that they've done a lot of leg work on top of it.
So yes, the presentation was clearly "planned". That doesn't make the data any less real.
But you haven't produced any real evidence for this claim.
The ICIJ has co-ordinated the reporting on the leak, sure; but that's not the same as claiming the leak itself was in bad faith, part of some wider state-sponsored conspiracy from G20 nations, etc.
It would lose credibility if it was just a dump. Some would claim its false, others would alter it, to the point that enough confusion would be created to make it totally untrustworthy. Unfortunately thats how manipulation works.
Did you have this same position with the Snowden leaks? Dump it on the web and it lacks credibility. Filter it through journalists who can use their resellers to make sense of it and the public gets to hear the important repercussions of the leak instead of having to try and figure it all out themselves.
At least they were transparent to exactly why the information was filtered. Credibility is certainly a good point but 100 people are going to have issue with sifting through terabytes of data.
People don't seem to understand what I mean by the above^.
The question is would it not be better to dump the entire data set to the public, instead of it being funnelled by reporters?