lol dude, seriously.....
Genre while it generally lists all things listed in Tags, is not tag itself.
Tags are what's listed at the very top of the thread, on literally every single page (regardless of whether it's viewed through pc or mobile)
View attachment 1738726
You see the little icon there, next to the date (which I circled in red)?
That basically means all the items listed next to that icon are tags.
And both "oral sex" and "vaginal sex" are listed in the tags.
So tags are all correct and up to date (the "vaginal sex" tag actually went up as soon as v0.07 went up last year with that update having Eiza sex scene) even though both Oral sex and Vaginal sex are missing in genre spoiler section of the OP.
The issue lies in you not understanding what is actually the tag (and where to actually look for it in terms of the game's thread), not with the tags on the thread itself.