I did briefly consider that this was referring to intercellular fluid, but "highly pressurized cores" is a terrible way to describe high IFP, so I rejected that interpretation. I thought the LLM was "trying to" refer to some kind of dense-walled cyst. (Of course, the LLM wasn't actually trying to say anything at all.) (And I think my argument there about osmotic pressure, oxygen diffusion and tissue necrosis is correct: hypoxia's already an issue for tumours, and there are only so many heroic workarounds available before a cell's only option is to die; and since blood pressure is higher than even the high IFP found in tumours, that's the appropriate bound for the argument I made.)

Your interpretation leaves the LLM's discussion of stroma as a non-sequitur, since that is not why high IFP causes problems for drug uptake; and at that point, I think you're just substituting a correct statement in place of the LLM's superficially-meaningful nonsense. I'll go through it again, this time focusing on the names assigned to each point:

"1. The Scale of the Human Body" talks about the excretory system. The part of the explanation comparing "tiny" to "vast" is at the very least misleading, but I would call it outright wrong. And yes: I am also thinking of all those "well actually, the geometry of the circulatory system" interpretations that make it correct, but… if a biology teacher explained it like this, would you really think they were teaching it properly? (I mean, seriously, calling "The human liver, spleen, and kidneys" "the reticuloendothelial system"‽)

"2. Tumor Architecture", under your charitable interpretation, isn't talking about "architecture" at all.

"3. Immune System Differences" is at least named right; but a treatment that only works in immunosuppressed patients is still a treatment. You could imagine a cancer drug sufficiently-effective that it is worth suppressing the immune system just so you can administer it. (I don't think it's likely that this is one – as in, I would bet good money against it –, but that's for experiment to decide.)

> You also cited my own comment at me.

Oops. That does make me feel foolish. In my defence: it didn't occur to me that anyone could think you were saying the same things as the LLM, because what you were saying was correct, and what the LLM was saying was nonsense.

Although, if you thought you were… is "tumor architecture" supposed to refer to the tumour microenvironment‽ That would explain the stroma mention, but… wow that is not a sensible way to say that. I continue to assert that the LLM's badly-plagiarising some papers, lecture notes and/or textbooks, blended with bad pop-sci analogies to the point of incoherence.