OP, I call shenanigans on that.
People who post Youtube transition videos and did start passing within 6 months almost all started with full heads of hair, feminine faces, and slight builds.
Take a look at some people who were bigger, and you'll see that hormones take WAY longer for those of us who aren't as biologically blessed.
I made it all the way to ELEVEN months on HRT without ever having been gendered female, not even once. And trust me, I was getting COMPLETELY depressed at that point, feeling like I'd never make it, crying myself to sleep at night because every single one of my trans friends had made it already and was full-time and passable already while I was still stuck back at the very beginning. I finally got my first "miss" about two weeks before my year on HRT mark. It took about another 3 months after that before I was starting to "male fail" and get gendered female sometimes even in my male work uniform. After getting fired from that job 14 months into hormones, I started presenting as female full-time, and since then I've only been gendered male ONCE.
Be patient. It takes time.
I don't have a recent "transition timeline" video, (I haven't done one since the 6-month mark,) but you can definitely watch my videos and see the progression. Here's my channel:
https://www.youtube.com/user/cheetaking243/videosAnd now, here is an official transition timeline from someone who was just as masculine as I was pre-transition. This should be definitive proof that it can take a lot of time to make it, especially for those of us who had a lot of male features working against us.
Here's Aztoreth Blemuz, and her first 18 months of transition. As you can see, she wasn't completely passing yet even at 18 months. She'd just reached "andro mode" where she was very in-between.
And then here's her "continuation" video where she shows what happened from 1.5 years on HRT to 3.5 years on HRT. And again, she went from looking androgynous at 18 months to being a complete knockout by 3 years on HRT. Point being, give it time. It takes a long time for a lot of us.