Since I was tagged here

- I want to reply on that.
The reason my voice was damaged ddue to the long term use was mostly becaus eI did it in a bad way. I did DIY voice training, part of it with instructions online, some by myself and not all of it was good. What really helps a lot - no matter if pre op or post op is the way to sound female. This has a lot to do with resonance, voice melody and other parameters that are independent of surgery. What got me into the mess was that my original pitch was very low, about 110 Hz. So with a soft and relaxed natural increase that also comes with the changed resonance to a degree, I was up in the 140 Hz range, which still is a male range. So I tried to push it further and this is what caused the problems. In could not keep a 180 Hz voice without straining it and so I eventually lost it. I did speech therapy then to get it all relaxed again and went back to the 140 Hz. I think it is beyond my natural range to speak constantly at >170 Hz, so that is why I eventually chose surgery. However, my voice was rather female sounding even at the low pitch I had before the surgery. 140Hz was still ok, it was perceived by many as a very very low female voice, except on the phone where I was usually misgendered when I did not push it up in pitch for that occasion. Proper voice therapy or training should allow you to use all kinds of pitches with low effort and this works actually amazingly well. I could do pitch glides rather easily in the end. Yet still, if I relaxed or did not watch it, I was down at the low end again.
Regarding the OP and the two videos. My guess is she had quite a successfu voice training in the first video already - she sounds low pitched but mostly female in that (especially given the noisy environment, which requires using more power in the voice, which makes it harder to control). The second video of course is awesome but I think it is mostly due to training. My take is, if you have a rather high male or androgynous voice before (e.g. 150 or 160 Hz which still is lower than the normal female range), the pitch increase that comes with resonance change (which is about 30-40 Hz) is enough to put you into a female normal range, maybe a bit at the lower side, but its safe. This is the case in a lot of people and they get by very well with voice training alone. People starting lower in pitch may struggle more to get this working withoutt doing damage. In the worst case if you are starting at 90 Hz and want to be in the 180 Hz plus reange, you constantly have to use your voice like a singer hitting higher notes. This needs a lot of care and basically you have to act like a pro singer all the time doing warmups, voice rests, voice strenghtening etc... Personally I think in that case a surgery (hopefully) makes that easier.
That said - what was written here is very true - you always always need voice training or therapy. With or without surgery. And if it is done properly, it will NOT make surgery harder, but it may be one has to unlearn a thing or two after a surgery. Dr Kim said I will have to use my natural relaxed pitch and not my trained higher pitch because if I do, I end up being squeaky at 260 Hz - LOL, which would be silly for a big woman like me. But I think I will manage to relax and speak naturally then. Its part of what I wanted after all..
Greetings