Salary Received in Switzerland by Indian Resident temporarily posted in Switzerland.

One of my friend working as IT professional at Kochi, India transferred temporariry to Switzerland wef 01/10/2024 to 30/06/2025.  He was receiving salary there and the same transferred to his savings account in India regulary on receipt of salary. NRE account was not opened as it was a temporary arrangements.

Kindly advise the taxability of that salary received outside india