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What actually is it, in reality, that will go wrong?
The problem is that to make it level the new pour would be ~3cm thick at one end tapering down to nothing over a few meters.
If you were able to deal with the bonding issues it you might want to make it level by making the entire thing a minimum of 5cm higher (i.e. 8cm at the lower end).
Personally I'd be making it the problem of the person who was responsible for laying it. They need to fight it out between themselves and the pumping contractors (who are also partly responsible due to the problems they introduced.)
Greenbank
@hugo7
Definitely agree on the ease of getting it level now. If it were me, I'd roughen the surface up (making lines/groves with a SDS sounds sensible) then just chuck some extra concreate onto it
But like I said I might be incredibly naive here....
...in my head, putting a weaker/less strongly adhered layer of 3cm concreate/leveling compound/similar on top of a strong base, which is then sandwiched down with the pressure of insulation panels, chipboard, followed by a wood floor sounds fine. It's a work shed, not a +2 story house.
What actually is it, in reality, that will go wrong?
The extra layer crack/breakup from downwards/sideward pressure of footfall, then shift over time, out from under the floor (or just one spot), resulting in that section of the floor sagging? Is that likely? If so can't you get some sort of slightly more flexible concreate to mitigate it?