Using the one measurement: "14.4 inches of ground clearance".. the first ladder-step is 16-18" off the ground, with the second being perhaps a little closer.. maybe 15" above (this is just a guestimate from the images). There are no obvious hand holds. It's not clear if the bottom of the door ends at the metal/bumper divide or in the bumper section (possibly the small orange light is on the door), but perhaps the door provides a small amount of climbing assistance (on one side only). How is a small child, someone not particularly agile, or even someone later in life going to board (climbing?) or exit (jump?) this thing? Especially with cargo? It's strange they mention the decoration on the seats, but not how it could actually be used.
Update: The Torus website[0] (which this article (by way of a another by Auto Express) just seems to be printing a press releases from) goes into a bit more detail, there is a mid-body door which can optionally have a pneumatic pop-out step, which will improve things (it's still a steep decline - would children be expected to board here too?) Only renders there too. Auto Express estimates the bus approximately costs an eye watering $475K USD