Why is "condit" not accepted as an alternative of "construit"? I suppose there is a nuance I'm missing
Even in the tips they put "condit". It should be accepted.
Why is balneo wrong?
Because it requires the accusative here, and not the ablative.
Ablative would be for a place (to be in the bathhouse), and accusative is for Construire + something (direct complement).
Aedificat should be added
Under "You have a typo," the answer is seen as "Balneum architectus constuit." The last word has a typo.
Please, Psittacus Ebrius (???!!!), don't report it here, as it's not the place and they won't read. Take a screenshot, fill a bug report, and alternatively, post on the troubleshooting forum.