Why does Exo terra say this tank is good for young balls if it really isn't?
Because Exo-Terra likes your money almost as much as you do... It's not like your BP is in imminent danger. He'll be fine in that enclosure until you can make other arrangements.
I think the picture you are referring to is on the Rodent Pro website.
Thomas "Slim" Whitman
Never Met A Ball Python I Didn't Like