This is, as Brian suggests, the 'turning of the fagus' (Nothofagus gunnii) an endemic species that is Australia's only winter deciduous tree.
They are found in small copses here and there - but it's the here I'm wanting the answer to.
A very interesting prehistoric survivor! Parts of both Lake Dobson and Lake Tyre in Tasmania look a bit similar and there are likely many other spots – as just a long shot, maybe Lake Dobson?
You are close Max, Lake Dobson is the limit of vehicle traffic but the trees are still a couple of hours away and at a much higher elevation - around 1100m.
This is one of many glacial 'lakes' in the area, somewhat contorted in this case (and where I pitched my tent for the duration).
I had done a quick run up the Tarns earlier without seeing a likely prospect. Now, after another trek, I’ll suggest the Twisted Tarn – the skyline looking east seems to be similar to that last (rather pleasant) shot of yours. Plus maybe the rock.
Max has it (as he so often does). Tarn Shelf (of which Twisted Tarn is at the end of the line) is one of the best places to witness the turning of the fagus. The closest relative to this small tree is found in Patagonia, a legacy of Gondwana. Here is how the whole area looks from the nearby ski fields.
I believe it is on R.Nossa Sra. da Praia, Praia das Macas. Beach of apples and river of necklaces - Ribeira de Colares. Not that I know any Portuguese, that's what google translate tells me.
And of course, apple strudel...