Basically they give you every version of Windows so you can test your code. So 10 LTSC is in there. I run it in my VMs because it uses so little memory and CPU compared to the regular one.
I don't know which flavor of subscription you need to get it. I got my sub free as an MVP.
Snooped around and looks like the only option is to purchase VS Enterprise + Github Enterprise (professional versions don't work). This is definitely going to be pricy. I guess if my company has enterprise license I might be able to take advantage of that...