I guess the confusion must be a feature, not a bug:

Leaked Brexit documents show worst-case scenario - minister

Leaked British government documents warning of the impact of a no-deal Brexit are based on a worst-case scenario, said Michael Gove, the minister in charge of coordinating preparations for leaving the European Union without a deal.

The official documents on a project titled “Yellowhammer” show that Britain will face shortages of fuel, food and medicine if it leaves the EU without a transition deal, jamming ports and requiring a hard border in Ireland, the Sunday Times reported.

… but…

Food, fuel and drug shortages: Leaked paper reveals no-deal Brexit fears

One Whitehall source told the newspaper: “This is not Project Fear - this is the most realistic assessment of what the public will face with no deal. These are likely, basic, reasonable scenarios - not the worst case”.

The dossier reveals that:

● The government expects the return of a hard border in Ireland as plans to avoid checks will prove “unsustainable”, risking protests

● There could be months of border delays that could lead to shortages of fuel affecting London and the south east

● Disruption at ports is expected to last for up to three months before the flow of traffic “improves” to 50 per cent to 70 per cent of the current rate

● The imposition of petrol import tariffs, which the government has set at 0 per cent, could lead to the closure of two oil refineries and 2,000 job losses, industrial unrest and disruptions to fuel supply

● There will be passenger delays at EU airports, St Pancras, Eurotunnel and Dover

● Medical supplies will “be vulnerable to severe extended delays”

● Fresh food supplies will be reduced, leading to higher prices

● Police resources will need to quell protests across the UK protests across the UK, which may “require significant amounts of police resource[s]”

● Gibraltar will face delays of more than four hours at the border with Spain

[…]

I guess they’ll find out soon enough if the the scenario is worst case or likely case.