Heating load calculation & layout plan DIN: Is a new calculation necessary?

Addendum:
He had made a mistake in the preliminary run and meant 30°C is not possible.

Furthermore, the pipe dimension is 17x2.

He also writes that much more doesn’t help anymore; the over-radiation is at an overlap of 5 cm, which then automatically totals 10 cm. Different room temperatures can then be hydraulically balanced; large differences in the rooms are not possible anyway due to the controlled residential ventilation (which is likely true).
A new calculation costs 400 EUR net. He doesn’t believe the showers will bring that much now, but is happy to install pipes underneath there as well.

Yes, a large undercoverage in the bathrooms. At what temperature were the rooms and the bathrooms calculated. I would not do without a wall heating. Then it may also be possible to lower the flow temperature, as the other rooms have an overcoverage.

All non-baths 20°C, baths 24°

What about the shower areas?

Well, as I said, he doesn’t believe it helps much, but he does it.

Oops, wait a minute. Could it be that no controlled residential ventilation was taken into account here? I only see outside air considered...