Do we need a lifting system as the architect suggests?

Hello! My architect (very old and always stressed) thinks that I need a lifting system. However, my sewer connections are 2.5m lower than the floor slab. What should I do? Thank you very much in advance!

What is the reason for the lifting station? Furthermore, a lifting station is not just a lifting station!

What is the reasoning? Which distance to the canal must be overcome? Is there a risk of flooding? Is a basement perhaps assumed?

Fecal lifting system to be exact. Street level, which is 1.5m higher than the house. No flood risk, hillside location. No basement present.

if the lowest toilet, then probably the guest toilet on the ground floor below the channel, you won't get around a lifting station.

Below the canal, or the connections to the canal? The toilet is lower than the canal, but higher than the connections to the canal, as mentioned, hillside location