Exterior walls built with a 4cm tilt

Because of 4cm ... I can't believe it.

You, as Büro_manager_, can't either. But you want to know better, despite having no idea what effects 4 cm have at this point...? How lucky that the OP can rely on your emotions!

Almost as helpful as:

... 4 cm are not just tolerance there, but also value-added tax, holiday bonus, and who knows what else Makrelen-Manni adds on ...

The OP will surely be well advised professionally ...

You want to know better though, you who have no clue

If my posts suggested any professional expertise, I hereby explicitly distance myself from that

Your quote referred solely to the statements that a demolition is unavoidable and, to put it bluntly, that the lawyer should prepare the complaint in advance

@TE: once again very clearly: I have no idea and please do not take my statements here in the forum as professional advice ... you should only do that with your construction supervisor, whom you are paying for this

It strongly depends on how thick the wall is.... a 15 cm wall with a 4 cm difference is worryingly crooked and simply cannot withstand the load of a force from above... with a 40 cm wall the situation looks completely different (however, a 40 cm wall is also significantly more difficult to build crooked, I assume this is a thinner version here)... but nevertheless, a lot has to be compensated with plaster. So, quite a few additional tasks come to all the following trades and that only because the mason botched it so badly...

P.S.
Statics accompanied me throughout my entire studies...

Replacing a load-bearing wall is not really a big deal nowadays. The ceiling/load from above is supported with sufficient ceiling props and formwork beams.

Definitely better than shoddy workmanship on construction sites. So 4 cm is already outside of DIN 18202.

But I still can't imagine what something like that looks like (except in houses from 70-80 years ago). Especially because the wall has to bow in one direction, either way. In other words, work to compensate for the botched job arises on both sides: the interior and the exterior wall.

my speech...all subsequent trades are affected...

The wall must come out without any ifs or buts. Regardless of the statics. I don’t know exactly how the rest of the wall structure is, how the windows are mounted. But I see quite a few disadvantages and little problems with the further construction if it stays like this.. just as an example:

-Will the exterior plaster be 4 cm thicker at the top than at the bottom? Does the plaster manufacturer approve this? Will it hold on the Styrofoam insulation, if present? Or does a sloped insulation have to be applied to the house?
-Will the windows be installed flush with the masonry? If yes, flush at the top or bottom? Or a frame installation - then with profiles of different lengths?

This could then possibly lead to the next botch out of necessity.