And the EU have stated that the WA is complete
But UK MPs rejected the WA three times.
only the PD can be amended now
PD does not enter the equation without a WA. Johnson has stated that UK will leave EU in October deal or nor deal. If it is no deal than WA is binned and UK must trade under WTO. Not the best option, but if a WA can't be agreed what option is left?
Looking at the new cabinet Johnson has formed even those MPs who voted remain in 2016 agree that the referendum result must be honoured. T May said same on her last day as PM. Many remain MPs who have appeared on QT have also stated that referendum results must be implemented in order.
Will UK suffer in the short term under a no deal? Yes very likely, but democracy has been preserved.
If in the future the voters think that leaving the EU was a bad idea they can vote in future GE for those parties that have another referendum in their manifesto. However, I remember that MPs voted against another referendum? So a GE is the only mechanism to introduce another referendum.
If another referendum took place and the vote was to rejoin then so be it. UK must apply to rejoin EU.
Yes referendums are based on %, but GE are based on seats. This is what favours leave. Whilst the % that voted leave in 2016 was 52%, the number of constituencies was 406 leave compared to 242 remain. That is a 62.5% leave and 37.5% remain. Likewise it is estimated that 60% of labour constituencies voted leave.
Best outcome is UK and EU to find a solution to the Irish Border as that was the sticking point in the WA.