The item heading
5. Be prepared to accept less than 100 per cent charge
is oddly worded.
It appears to suggest that you'll normally expect to charge to 100% and that on rare occasions you won't. Which as most of us here know, the majority of the time you would generally not charge to 100% on a public charger (particularly a DC charger). The exception being if you were travelling a specific route that has no charging or unreliable charging (insert Tritium joke here).