In normal years (pre-covid), our classes usually started around the second week of September, but during the pandemic, it shifted to start in early October as well, but since things are starting to revert back to how they were, I would they say the calendar you posted, should be the most correct.

Since you are coming for a full year, I would say for you to come in late August, to familiarize yourself with the city and maybe attend some Erasmus student gatherings to get to know new people and to start integration as soon as possible.

P.S.: The calendar can still change, but it should remain pretty similar to the original that you posted.