If you want to make an accusation, you should word it in a more formal manner to be taken seriously.
As much as I like this work, the artist's Twitter does have an abundance of A.I. generated content. But they've also shown that they can at least illustrate in this style and make simple animations.
Though the animation in this post is a bit more advanced than that, and seems to be at least AI-assisted if not fully generated. They have another animation that clearly uses AI in the process.
It's likely they did draw the base illustration but then used AI to animate it. I'm not sure where that falls within the rules.
Having thought about it, I still don't think this post is AI.
Comparing this post with the obviously AI one, this post differs in several big ways.
First is what looks like rigging of components. The AI one has completely frozen hair. Hair in this post is a lot more animated.
Then, there's the mouth. The mouths in this post have much lower frame rates than the hair. They look keyframed without intermediate frames. You can see the reuse of frames. For the mouths to be animated so differently from the hair this post is much more likely to be human-animated than AI.
All things considered, the difficulty of animation of this post is not way beyond this artist's other animation. It's slight deforming, translating, and rotation of layers, plus cycling keyframes for the mouths. It's not unbelievable that the artist can animate this.
On the contrary, the AI one has elaborate hand and mouth animations, but also several obvious flaws. The texts in the eyes become deformed and then garbled when they eyes blink. Miku's skin tone changes, and if you look at their hair, the colors also change slighly from frame to frame. The tongues melt as the mouths move. In this post, the texts aren't affected by the eyelids at all, the colors are very stable, and the mouths are, as mentioned, keyframed.
