The point is they did point to such a clause in the contract on or around July 25 2007.
The point Rasmussen is making is that on or around 25 July 2007 it was not a new fact that came to light there and then but was already well known ad approved by Rabobank-management no less in April 2012. Under Dutch law you can dismiss for cause or gross misconduct if you like (see the definition for termination or dismissal for cause:
http://jobsearch.about.com/od/jobloss/g/terminatedforcause.htm) at the moment you find out about it or shortly thereafter. Therefore according to Rasmussen there was no cause or misconduct (remember he claims it was approved by Rabobank-management) or even if there was it was known well in advance of 25 July 2012 and therefore there was no longer an urgent or compelling reason for immediate termination of the contract on 25 July 2012.
I think he has a point there and it will cost Rabobank a lot of money to make this go away.
Although I think the law doesn't prohibit Rasmussen from making this point, me thinks it is somewhat cynical that Rasmussen is exploiting this possibility knowing full well he is lying under oath and used PED's and knows very well that the same contract he is now using to get his due also states that using PED's is prohibited under the contract. Then again if Rabobank knew he was using PED's (neither party is claiming that by the way) it will be like the thief stealing from the bank robber (no pun intended).
Regards
GJ