This is basically an argument about whether “interdimensional” means anything real in physics, or whether it is just vague UFO language dressed up in advanced maths.
From a spacetime point of view, there are three different ideas being mixed together:
1. Normal physics: 3 space + 1 time
Our standard picture is 4D spacetime:
three dimensions of space, plus one dimension of time.
Objects move through spacetime along paths. They cannot disappear, reappear, accelerate without force, or violate causality unless something unusual is happening with the observation, the object, or the physics.
So when people say UAPs show “impossible” motion — instant acceleration, sudden disappearance, no inertia, shape-changing — the question becomes:
Are we seeing measurement error, advanced but ordinary technology, or something outside our present physical model?
2. “Interdimensional” as a higher-dimensional explanation
The Grok answer is trying to say:
Imagine our world is like a 2D sheet inside a bigger 3D world.
A 3D object passing through that 2D sheet would look bizarre to 2D beings. A sphere passing through Flatland would appear as:
a dot → a growing circle → a shrinking circle → gone.
To the 2D beings, it would seem to appear from nowhere, change size, then vanish.
Now scale that up:
Maybe our 3D space is a “slice” or “brane” inside a higher-dimensional reality.
A higher-dimensional object interacting with our world could appear to:
enter suddenly, disappear suddenly, change shape, move in ways that look non-local, or seem unconstrained by ordinary inertia.
That is the basic “interdimensional” idea.
3. Why Weinstein is objecting
Eric Weinstein is saying: fine, but that is not yet physics.
Physics needs:
equations, predictions, measurable consequences, falsifiability, and repeatable data.
Without those, “interdimensional” is mostly a placeholder. It may sound mathematically suggestive, but it does not yet define a proper theory.
So his objection is:
Are national security people using serious technical language, or are they using sci-fi words because they do not know what else to call it?
That is the key point.
The later “Chronoflux / Dirac fluid / graphene” stuff
That part looks much weaker.
They are pulling in phrases like:
covariant continuity, quantum coherence, hydrodynamic time-flow, graphene Dirac fluid, zero inertia.
Those are real-sounding physics words, and some refer to real concepts, but they are being combined in a way that does not clearly form a recognised physical theory of UAP motion.
Graphene Dirac fluids are about electron behaviour in a material. That does not automatically explain macroscopic craft moving without inertia. That is a huge leap.
The clean version
The serious spacetime question is this:
If something appears to violate normal motion in 3+1 spacetime, one speculative explanation is that it is not fully confined to our 3+1 spacetime.
That could mean:
it moves through extra dimensions, and we only see the part intersecting our world.
But currently, that remains analogy, not established physics.
The best way to hold it is:
“Interdimensional” is not a precise scientific explanation. It is a speculative label for behaviour that, if accurately observed, would require either new physics, hidden dimensions, warped spacetime, or a major error in interpretation.
So Weinstein is not saying higher dimensions are impossible. He is saying:
Stop pretending vague language is a theory. Define the geometry, define the dynamics, give equations, and show what would be observed.