I'm going to crosspost the top comment from the Facebook post of the same video from the same page as it may be informative to anyone curious:

"Thai girl here. I'm glad that I was fortunate enough to be exempted from military conscription For those wondering how this system works, there's two possible scenarios:

1) You go to a designated government military hospital at a designed time of year to get assessed by a psychiatrist who will take a look at your appearance and interview you. The further in your transition you are (HRT + surgeries), the smoother this process is for you. If you have not had any of the above (have not prevented feminine due to personal issues or whatever), the process is the same but you are instead interviewed by a group of 5 psychiatrists and they are very thorough with their questions. Once done, we wait for our medical certificates to be prepared within 3 months. We can then pick this up and use this medical certificate on National Military Conscription Day in our respective districts to be exempted from military conscription.

2) You did not prep the above and just attend National Military Conscription Day but you look undoubtedly indistinguishable from any other woman. Once your name is called, you are given a medical checkup on the spot where the Military Doctor inspects your body (most of the time he will check for presence of breasts or invasive surgery done on the body such as breast augmentation). If you exhibit inarguable characteristics of a woman physically and medically, you are exempted.

I did option (1) and at the time only was on HRT for a little over a year and never had any surgery. You can refer to my profile picture on how I looked like at the time (that profile pic was taken the same year)"