The TVTropes Trope Finder is where you can come to ask questions like "Do we have this one?" and "What's the trope about...?" Trying to rediscover a long lost show or other medium but need a little help? Head to Media Finder and try your luck there. Want to propose a new trope? You should be over at You Know, That Thing Where.
Informed Attribute, in general
And maybe Cutscene Power to the Max
We can never truly eradicate the coronavirus, but we can suppress its threat like influenza
It's definitely not Cutscene Power to the Max. That's for when a character displays some ability that's far stronger than anything they can do in-game. A Depopulation Bomb and an Earth-Shattering Kaboom-bomb are equally destructive, just in different ways. More importantly, the player never actually uses the Iron Helix in the game, the objective of the game is to prevent it from being used.
I'm not sure Informed Attribute works either. That's for when something is said to be one thing, then that detail is just not shown, period. The Game Over cutscene shows the Iron Helix being activated, it's definitely as destructive as they said it was, just not in the way they said it was.
Informed Attribute can count "they said one thing about it, but it shows another thing instead".
We can never truly eradicate the coronavirus, but we can suppress its threat like influenza
It still seems overly-general to me.
Informed Power or Informed Ability might work, though.
"Incorrect" in a Series Continuity Error kind of way, or in an Unreliable Expositor kind of way?
Well, it doesn't really have anything to do with continuity, and there's never any revelation about any of the cast lying or anything like that, so neither really.
What it is, is that multiple lines of dialogue, as well as info from the manual, say this weapon has certain characteristics, but when we actually see the weapon in-use it displays completely different characteristics. No one ever comments on the discrepancy, and the end result is effectively the same.
Honestly, it feels like a miscommunication between the writers and the visual artists. Or perhaps their budget meant they couldn't show the intended effects, so they went with this easier to illustrate outcome. That's just me speculating though, there's no way to verify any of this.
Oh, and this all happens in a single game. Iron Helix doesn't have any sequels or other installments.
Edited by Primis
^ Coconut Superpowers is when superpowers are limited to real life budget (and other real life stuff). You may try checking it.
We can never truly eradicate the coronavirus, but we can suppress its threat like influenza
Is there a trope for when the visuals in a cutscene contradict in-game dialogue or Flavor Text?
The example in question is from Iron Helix. The "Iron Helix" is a weapon that is consistently described as a Synthetic Plague / Depopulation Bomb, but the Game Over cutscene that shows it being activated depicts an Earth-Shattering Kaboom instead.