Some one should offer him one, I'm not familiar with UK constitution and Law but I guess if the parliament says no the brexit it's done
Unfortunately he is right. Parliament will need to vote through the terms of the final deal, but not the actual act of exiting the EU - that will be done via the vote on Article 50.
Once A50 is triggered, according to our government we have left the EU, and it cannot be reversed. Any deal can land in the lap of parliament, but it will be a case of deal or no deal - the Remain case and all its voters will be cut out of the debate. As my party has put it, what has started with a democratic referendum will end up with a stitch-up - a PM and cabinet that nobody voted for implementing a deal that nobody wants, rushing the entire process to ensure we're out of the EU by the time May will be up for election in 2020.
There should be a referendum on the final deal, to ensure that the public has the ability to put pressure on May to get the best deal for the whole of Britain, not just Farageists. Otherwise the 2020 general will instead be that referendum.
My hope is that my party will propose re-entering the EFTA/EEA with a view to regaining EU membership as our European policy in that general election. If you agree, and want to help our pro-Europe platform, you can get involved and help us present the pro-EU case to the British people.