Staircase shifted by 10 cm, options?

The plan was a staircase where the last step at the top is only half a step width (about 15cm

And that, in my opinion, would be the much bigger problem if you come from above and suddenly there is no step. Life-threatening...

That means it starts 10cm too early.
According to the plan, there should be 1.05m of space before the stairs; currently, it is 94cm.
Therefore, the last step at the top is 10cm lower (according to the plan, the last step would not have been a full step).

By this point at the latest, I expect not only a plan drawing but also one or two photos.

And that would be, in my opinion, the much bigger problem if you come from above and suddenly there is no step. Life-threatening...

I suspect the top step is level with the floor slab. This happens quite often, so that there is only half a step depth. Some don't even have a step there. We, for example.

I suspect the top stage is at one level

Only photos show the truth...

I wouldn't worry too much about that. In my opinion, that is not a minor defect and cannot be adequately compensated with money. So demand a dismantling and have it redone. That doesn't really please anyone involved, but I wouldn't know any other satisfactory way for the client.

So, here are a few pictures:

In the plan, you can see that the staircase is supposed to be flush with the wall and there should be a rough construction measurement of 1.05 cm between the stair step and the wall.

In this picture, you can see that the metal construction is already protruding beyond the wall. The finished stair step will protrude about 4 cm further.
Here is the staircase in section:

Here is the staircase viewed from the upper floor, where you can see that the last step (which is at the same level as the finished floor on the upper floor) does not have the full "depth" (step width):


Here the staircase rests on the ground floor:
The stair opening would basically have to be reduced by 10 cm to allow space for the shortened metal construction.


View from above:

View from below (before screed):


If more plans/pictures are needed, please let me know.