En effet le mot est bien "insuffisant" ou la phrase remplacée par "n'avaient pas été suffisants".
dixit le même paragraphe du sacro-saint livre de règle originel en anglais :
"When allocating Titan killer hits that may cause multiple
points of damage, roll for damage immediately after
allocating the hit. The War Engine counts as having
been allocated a number of hits equal to the damage
rolled. This is solely for purposes of allocation. Damage
is applied as normal, only after all hits have been
allocated.
Example of Play: Titan Killer Weapons
A formation of Shadowswords scores 3 Titan Killer (d3)
hits against a pair of Warhounds. The first hit is
allocated and the roll for damage is 2. The first
Warhound counts as having 2 hits allocated to it.
Because it has 3 Damage Capacity, the front Warhound
can still be allocated an additional hit. The second Titan
Killer hit is therefore applied to the front Warhound. The
die is again a 2. Multiple Titan Killer hits don’t “spill
over” to other units in the formation, so the lead
Warhound will take all 4 hits. As the number of hits
allocated exceeds the Damage Capacity of the lead
Warhound, the final Titan Killer hit will be allocated to
the second Warhound. Note that even if the lead
Warhound had been damaged and the 2 points of Titan
Killer damage from the first shot would be enough to
destroy it, damage is only applied after allocation. The
Warhound would remain in play until all hits were
allocated exactly as above. Once allocation was
complete, the damage would be applied and the
Warhound removed."