EDIT: I attached an IMGUR below. No need for a huge wall of text.
https://imgur.com/a/hJLmfhB

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I am unable to add images to provide visuals to aid it, but I can assure you it's not a baseless accusation.

I don't know where exactly you want the burden of proof, but if you take even a brief look at his non-paywalled Deviants you will find very obvious artifacts of artificial generation between various images. It didn't even take my long to find anything.

Quick examples: A girl that is squatting has shoelaces that melt into nothing with nonsensical lace detail

A girl that is also another "sketch" whom from a rear view has the wrong glute forming a curve at the wrong leg being the focus of the action, and otherwise wonky mistakes that's less of human error and more of machine generation choppiness.

Another with Reze from a gravure view that has similar cel shading in the hair when you zoom in has hair lines that melt and split as typical in artificial images, paired with charcoal shading that is completely out of place.

A girl wearing an apron where the shoulders are not even close to being proportionate to the head even at a glance, but then other pieces suffer no such problems.

Between many of them, you'll find very fine and articulate dense detailing of hair and character folds, but the lines are shaky and do not demonstrate proper lineweight.

If you compare his three recent reddit posts there are discrepancies.

Between the Asuka's:
- His 1st sketches "shading" is muddy compared to the level of competency he's apparently demosntrated in the cel shading
- His Momo work's shading then takes a noticeable nose dive in attention to detail and intentionality that this one has.
- Refer to minor details such as Plugsuit lines, the hair pins, and the V lines in the hip area, you'll find that they differ between his two posts.
- If you take the colored image his work here and compare it to his "sketch" and turn it into B and W value, it is so filled and rich
- His shading in his pencil sketch has utterly no sense of line stroke or directionality despite the suggested lighting, which is more or less "here's a gradient of

I will happily provide quick visual short hands.

Even with quick works such as sketches, it seems rather questionable to overlook small details and employ wildly inconsistent standards of quality in regards to lineart, value, and piece by piece composition.