No and Yes.
Yes it uses dosbox, but dosbox is compiled into a new executable. So the original dos executable is not present and it doesn't use the standard GOG dosbox version.
I see. Is it a custom DOSbox binary. Can I use my system's DOSbox to play the game, then?
Sorry, I thought I made it clear when I said the original dos executable is not there, they have merged the original game and dosbox into a new program for modern operating systems, so it cannot be run with any other dosbox.