Ypsfo9,
If there are folks who can empathize with your need to obtain or chase some internal level of feminine ideal, it's the people on this forum. Many have made the GCS/FFS journey only to recognize (hopefully) that the chase for perfection is a myth. If YOU can clock anyone, no matter what, as you claim, then you should assume that someone can just as easily clock you using the same methodology. It's not rocket science, it takes one to know one as they say.
My guess is that out of the context of this YouTube video or grouped with other trans-people, this woman is perceived as she presents 99% of the time. It's not likely that her facial features would be the elements giving her away, it would be something else like her hands or her voice, or even the shirt she's wearing that might say, "I'm Trans". Who knows? It's a rare individual that checks every box on the unclockable list and if they do, chances are they got most of the way there without any surgery. Perhaps they simply transitioned at a very young age?
If there is anything I can add after looking at the Korean surgery websites is that they have extremely photoshoped pictures using selective angels in their after images. Even in the videos, it's difficult to compare the real before and after results. That would make me uneasy too. I think they sell a nice story based on their expertise with V-line surgery in youthful Asian faces and it's aligned with their cultural norms. Personally, I think it looks a little extreme for Western FFS profiles. My aesthetics may be subjective, but the increased risk of complications from behind-the-ear V-line surgery is not. You should make sure you understand those risks while you're there and then follow that up with a 2nd opinion from another FFS surgeon at home.
We are ALL our own worst critic. You should take this to heart as you proceed because it looks like there's going to be a pretty harsh judge of your appearance looking back at you in the mirror. I wouldn't wish that on anyone and neither should you.
Beauty culture is a cruel, cruel mistress.