Looks like underlayment to me. Some will use underlayment for projects, others only for practice. It does tend to have thin face veneers and a somewhat high number of voids. At $1/sheet it may be worth a shot, with the understanding that it ain't baltic birch.
If you price it out what sounds like a good deal ain't. If I read this correctly they are charging $1 per square foot. The cost of 1/8" quality Baltic Birch from The Hardwood Store is only $0.80 per square foot and 1/4" is a $ 1.28 per square foot.