I think I know what you mean, and yes, it comes down to that card having ambiguous wording.
The intention: whilst tucked cards are normally worth 1 point at the end of the game, Ichor Maw essentially takes that 1 point per tucked card away.
An alternative way of wording would have been: "Tucked cards do not score at the end of the game". However, I want to leave room in case there are future cards that boost the value of tucked cards, without having Ichor Maw completely negate them. That may be the cleanest solution, in terms of wording though.