Ask CA or NZ Board.
Now there is no ICL even where NZ cricketers can go. Rather than blaming IPL why don't you talk about your players and board.
If the players didn't sign their national contract they would be allowed to play in the IPL I believe. Six of our players (IPL Contracted players) were given another two weeks to make their decison, after they signed their contracts we were told the tour had been shortend. Yes it's up to the player's to make this decison but it isn't the NZC Boards fault.
I've already given many reason's why I don't like the IPL so I'm not going to go over that again but it would make sense to make a window for it so player's don't have to make that choice.