I don't know if that means he intends to resign and be famous for being the shortest lasting PM in history, or whether he intends to break the law
I think this is causing a lot of confusion as the media, or certain elements of the media are mis reporting.
The law says the government must revoke. It does not say Boris must. They are two very different things. Boris is not the government. He is the leader of the government.
Boris has three options.
He can send a minister or advisor to revoke if he chooses not to.
He can resign. The government will still send a minister or advisor to revoke if he does so.
He can't attempt to break the law (highly unlikely) and refuse to do it himself or send anyone to do it. Also irrelevant, as he would be removed from office, and yup you guessed it, within 48 hours an advisor or minister would be sent to revoke.
The issue here is what Boris will personally do. It impacts who our government will be, our prime minister, when and if there will be a general election.
It doesn't remotely impact on whether the no deal law will be implemented. That's a given assuming there is no agreement on a deal.
The other parties now have the majority and they have the power in parliament. They are using this power to their advantage by uniting.
They won't permit an election prior to brexit. They fear he will gain a majority and then change the law to permit no deal with that majority. He also has the popular vote right now and could take many seats off of them.
Post the eu summit on the 17th, if he doesn't get a deal, or if he revokes, or sends someone to, his popularity will dip. Hence the opposition all want an election after this. They don't want to risk loosing seats to him before that and him gaining power in parliament.
He can try to pass a law to have an election but this is hugely risky. As the remainers Will likely amend the date, make it November, and he is then legally bound to have the election then.
So the law is the government must seek an extension if there is no agreement. The government will do this. What Boris does is a different matter and impacts the future of this country in terms of who governs. It doesn't impact on whether the no deal legislation will be applied.