Austrian media has more information:
https://salzburg.orf.at/stories/3321288/
Main points:
They were in a catholic care home in a nearby town:
Seniorenresidenz Schloss Kahlsperg in Oberalm (Tennengau)
Now they have medical care through a GP who has her surgery at the same castle (I assume there are several buildings etc)
Food: deliveries through helpers, evening meal cooked by themselves, they used to have a kitchen which was removed in the meantime and which they want back
One nun needs oxygen, another is diabetic
Also removed since they moved out were additional toilets / shower rooms (why?), which they demand back, too.
They had 4 stairlifts in the buildings, which were all removed, and they demand them back, too.
I don't understand why you'd remove parts of rooms when the next use for the building isn't clear yet
There is a dispute about whether you can adapt their building or not; the bishop etc say you can't; but they insist you can and that they didn't refuse adaptation for their needs 3 years ago
Now the church higher-ups say they wouldn't invest any funds for adaptation anymore, all their needs would be taken care of at the care home.
When they moved, the monastery was transferred to an augustinian foundation, and the connected school to the arch diocese of Salzburg.
The previous agreement states that the nuns were allowed to stay as long as it was "justifiable" regarding their health situation. Two of the three were hospitalized before the care home, and then someone (?) made the decision that they couldn't stay there anymore. Possibly they moved everyone so that they could stay together, and realistically one person shouldn't live alone there.
They have a teacher's pension but currently can't access it.
It's a great story, and it is likely that the new owners have financial interests and don't want them living there anymore. If someone lived somewhere 60+ years, it surely is difficult to let that go. There is a danger of de-skilling in care homes, too, when they could do cooking and other tasks by themselves.
On the other hand, when their health varies and one will become more ill, then you will end up with the situation that only 1-2 persons might be left, while the other has to move back to the care home. This will break up their group, too. And the longer they wait with the move, the harder it will be to get used to the new surroundings.
Another aspect which might be important to to them being nuns, is that they are used to a much much calmer environment than a care home is, and that it just drives them crazy, and I can understand that as well.