Looks like yet another builder forgot to design in their Part M access ramp.
The correct way to do this is to build a wall about 2" away from the house with the paving slab overhanging say 1.5" so there is only a 0.5" gap to cross. That way you have a level access with no risk of rain blowing under the door and you don't bridge the DPC.
What do they plan to do either side of the ramp? Fill it up with topsoil that will also bridge the DPC?