Feels like this was either an attempt at April Fools prank, or there were some issues with copied notes. You can delete them if you want, I can't do it on mobile.
Actually, Reimu did declare to Rinnosuke and Marisa inside Kourindou that"the Unnamed Book Reading Youkai(Tokiko)",by canon source material("Curiosities of Lotus Asia" - early-ish chapter )was "...pretty Cocky and surprisingly Strong... "Tokiko" was also tenacious because she followed Reimu inside looking to further settle their score,and in the end it took Marisa who "had to drag her outside in order to have a Final Danmaku Duel to chase her away".
The trends in question do not include parodies of memetic moments/quotes or popular expressions/reactions such as nyoro~n, can't be this cute, and the troll face.
oversized index and middle fingers, melted hair (take a good look at the locks on his shoulders and his right hair antenna), off-center, melted-looking buttons and the resolution (2x upscale of 768x1344, a known base resolution for generating portraits in models descended from Stable Diffusion XL).
What's going on here? I get that he's checking the model to the reference. But the series of facial expressions she displays near the end is very hard to read; initially a light smile, then maybe crestfallen (as if she's responding to the artist's expression of disappointment), then worried (like she's afraid she'll be deleted), then she spasms.
And aside from being false in this case, self-upload isn't a valid flag reason, anyway. Self-uploads may be unofficially discouraged (at least by a segment of the userbase here), but the rule against them was repealed some time ago.