Wow, I didn't realize that Dwarf Fortress is being developed on Windows. Up until this point, I'd naively assumed that this game had been initially developed for TTYs and only later ported to graphical operating systems! Go figure, huh?
By default, even if it looks like a TTY, DF renders to a graphical buffers. Most TTYs are too slow to play dwarf fortress, but you can actually configure it to render to a terminal. It's just not the default.