You mean Lord Kerr? That is 100% incorrect he was on the radio and news as the writer of Article 50 saying it is absolutely revocable.
We are still in the EU, under all our current terms, they could not force us out whether they wanted to or not, of which there is no sign they would not welcome us back. In fact there have been several articles and interviews from prominent EU officials saying they would very much like us back.
Pesky facts, they do get in the way of conjecture.
'Lord' Kerr does indeed believe we should step back from the brink. He is now an adviser to Nicola Sturgeon and is looking to find a way for Scotland to maintain its links with the EU. I realise Kerr drafted Article 50 in the first place, but his is not the sole voice on the matter, others take a different view on the possibility of unilateral withdrawal of Article 50.
I believe even Kerr argues that we could only reverse the decision through a further General Election followed by a further Referendum. Given that the Remain parties lost seats in the 2017 General Election and opinion polls (for what they are worth) on the matter are almost exactly as they were in 2016, even assuming Kerr, and those who agree with him, got their way it's a slim chance it could happen.
As we all know, if you employ a lawyer they will argue almost anything for you for as long as you pay them. Your suggestion that you are presenting facts, and people who disagree are presenting conjecture is disingenuous.
Whatever the legal arguments either way, it's a political decision, and unless there is a radical, unforeseeable, change in public opinion, in the Conservative party, in Labour, in the EU itself, in the other 27 states, it's not going to happen, and we need to face up to that.
I understand the desperation, I really do, but it's crazy to be having these arguments now after the 2015 election of the party promising a referendum, after the referendum itself, after the Miller case in the Supreme Court, after Article 50, after the 2017 election.
Parliament may well be sovereign over the UK, indeed this is in my view the one good argument the Leave side had, but it certainly isn't sovereign over the other 27 EU members. Suppose in March 2019 the unlikely event Parliament votes against whatever deal is cobbled together then, it cannot force the other 27, or the EU itself, to offer us some other deal. We likely then leave without any deal, the government falls and we probably have a 3rd General Election in 5 years. Then after that we get some lunatic like Rees-Mogg or Corbyn trying to negotiate a new relationship with the EU, which makes the current situation seem comparatively positive!