In Britain, a referendum has to add the words for it to be legally binding, such as the Proportional Reprresentation question. The fact that it didn't automatically meant it was advisory only. That's what the article explained, and was agreed by the High Court.
A leaflet is no more legally...
It doesn't matter what people know, ignorance is no defence of the law. That's why we have courts, and judges, who sometimes have to direct our own politicians. It was why Gina Miller won her case.
Why do you think David Cameron ran off with his tail between his legs?
https://fullfact.org/europe/was-eu-referendum-advisory/
It has been confirmed by the High Court, which still has jurisdiction in this country not the ECJ.
You're right, and many leavers have realised what a mess is happening, and changed their minds.
Apart from anything else, those that keep quoting democracy, really should read the wording of the Referendum Act 2015, where it said the referendum result was advisory.
The people of Grimsby who voted Leave by 70%, have asked if special agreements can be made with them & Europe, as they've now realised what they're losing. Special agreements like what they've had for the last 40 years.