How so?
So, the following does give me some concerns:
1. You can't have the floor flow continuously. If you ever want to rearrange the kitchen, you'll have a problem.
2. Drain noises are at least conceivable because everything is exposed.
3. Sloppy work indicates deeper problems.
4. Screed height raises question marks. Why is the pipe sticking out when 15 cm is the normal floor construction?