I think he's referring to an issue with the European Union laws which state that election results must be held back until all member states have finished voting

I think he's referring to an issue with the European Union laws which state that election results must be held back until all member states have finished voting. However, in the Netherlands, it is law that results must be counted immediately and published as soon as they are counted. So, in the previous election, the vote was technically illegal under Netherland's laws. However, this time around, it seems Netherlands isn't holding a vote until the last day of voting.