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I agree, but actually, it's not even possible to draw a uniform 3D grid through the universe because of the curvature of spacetime. So even if the universe is a simulation, I don't think it could possibly work the way they describe and show the kind of artifact that they measure.

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Yes, it's possible that a simulation would use a non-uniform lattice-like data structure. Maybe something like a quad-tree (with appropriate dimensionality) where the granularity of the structure varies according to the local density of data.

Granted, such a data structure would need to be expressed in a coordinate system, which itself defines a grid or matrix. But can't coordinate systems use non-uniform representations? (analogous to floating-point)

Am neither physicist nor CS person, so not sure all of this holds together, just wondering.

Be sure to email the physics PhDs who published this paper to let them know of this flaw you have found.

Be sure to leave it at that snide remark and not actually explain the flaw in my reasoning, so that I can avoid learning something.

The point was you made a claim not a question. As snide as my remark might have been, you're insulting the people who did this research by being so matter-of-fact'ly dismissive of their work based upon a very basic observation that they surely must have considered.

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