Yeah if i remember correctly you are right. But I can add that at 5 the gas chambers are basically gone, but right behind them, the big grey area we see, is a big memorial that has been build afterwards.

Also i believe the building on the left was some kind of workcamp where a few prisoners were "allowed" to help kill their fellow prisoners in some way.

Source: Was there 2020 right before the pandemic. One day Ausschwitz 1, one day Ausschwitz 2. Harrowing experience, but I can still only recommend visiting both.

No, this is Ausschwitz 2. You can see that most of the buildings are destroyed. Also you can make out the traintracks and the entry house where the famous photo was made. Some of the Barracks are still standing and are kept in the historical state as a museum and a memorial