Pretty sure the new Tamiya is the same width/wheelbase as the older minis...
Perhaps the picture is distorted lengthwise, but if you look at the battery in the picture and take its length and turn it sideways it looks like it would fit hence my comment. The older minis did not allow this at all. Sure, everything else has to go out of the tub, not sure where but I think the battery would have the priority in the interest of weight balance.