We add things to the database that have calories burned estimates based on independent research (so not just based on what the company says the machine burns.) This machine probably isn't in the database because it's newer and not very common.
At this point, I'd either find a similar activity, or wear a heart rate monitor to see how much you're actually burning.
Hope that helps,
"You may have a fresh start any moment you choose, for this thing that we call "failure" is not the falling down but the staying down." Mary Pickford