Good insetting. I just suspect the proportions are not the same as the course. Not a complete problem built sometimes happens to students if that did not apply the scale on the object.
I have to try again
Looks right now.
I think there is a diffrence between blender 2.8 and 3.0 in the scales because i used 2M extrude 2M insett to get it like the course
No Blender units are the same. By the grid you have a 40 x 40 pyramid. Possibly not exactly centred in the ‘world’ by a fraction. It also looks 2 x 2 steps. Going by eye and the grid. Somehow twice the size of the course if I recall correctly. No big deal, the proportions are looking right. Theoretically if you wanted to you could scale it by .5 (Then apply the scale)
Do not stress or worry over it. The rest of the section should carry on without numerical bother. Or none you will not easily work round.