Cringey....

it is a OneeLoli anthology,,it says in the title, oneeloli refers to older girl x loli lol

Yes, I am aware. What I am saying is that it shouldn't be in the Yuri genre but in a genre of its own, "lolicon" or whatever you want to call it.

I wonder if there's any way to report manga as being in the wrong genre section cuz this is FAR from the first time mangago has mis-genred an upload

but it isn't in the wrong genre.
all content that focuses on the romantic relationship between 2 girls is yuri.

the japanese title quite literally says おねロリ百合アンソロジー (OneeLoli yuri anthology)

I looked it up, there is no lolicon genre category so you're not wrong. Strange how there's a shotacon though. Still, it rubs me the wrong way to have this in the same genre as yuri romances with characters that have reached the legal age of consent.
It's the sole category of "Yuri" that I have a problem with

what i meant was that in japan, manga that focuses on girl x girl in called yuri (it's the same for BL too, manga that focuses on boy x boy is BL regardless of whether it is problematic or not)
so oniishota (おにショタ) would also be considered BL.

i'd consider things like oniishota, oneeloli, oneeshota and oniiloli as sub-genres.
oniishota is under BL and oneeloli is under yuri, because these relationships focus on boy x boy and girl x girl.

the genres on this website are kinda weird, shoujo ai and shounen ai arent genres in japan.

That is fine, you have stated your point. My main concern is that "lolicon" is a sensitive topic or potential "triggering" topic because it has issues of paedophilia and exploitative elements surrounding it. I assume most people would click on the manga image thumbnail without looking at the title because it's already in the Yuri category and thus become deceived or shocked that they have stumbled upon something else entirely.

ahh i see.
yes this is understandable. works should be tagged properly, especially if they have potentially triggering content.