About Sign E1 and E2: parking ban or standing-still ban: which statement is WRONG?

✓ With sign E1, you may also no longer stand still to load/unload or let a passenger in/out.
It is exactly the reverse. Sign E1 (one diagonal stripe) = parking ban: standing still for loading/unloading or getting in/out is still allowed. Sign E2 (two crossed stripes, a cross) = standing-still ban: that forbids EVERYTHING, including loading/unloading.
'these signs only apply to the side of the road where they stand'. The opposite side can have a completely different situation.
With E2 'you may not stand still afterwards (and therefore not park either)' — with no exception for loading/unloading.

Correct answer: With sign E1, you may also no longer stand still to load/unload or let a passenger in/out.

Explanation

The book states explicitly: 'You may still stand still to load/unload or to let a passenger get in/out.' E1 forbids only parking

It is exactly the reverse. Sign E1 (one diagonal stripe) = parking ban: standing still for loading/unloading or getting in/out is still allowed. Sign E2 (two crossed stripes, a cross) = standing-still ban: that forbids EVERYTHING, including loading/unloading
'these signs only apply to the side of the road where they stand'. The opposite side can have a completely different situation
With E2 'you may not stand still afterwards (and therefore not park either)' — with no exception for loading/unloading. E2 is stricter than E1, not equal to it