UHT milk has a shelf life of years as long as the pack's not open.

Once the seal has been broken, it should age and spoil at around the same rate as normal pasteurised milk.

So the real secret is

1) small packages, portion size

2) a way of extracting milk that keeps the contents sealed. Something like a bag-in-box wine container?

Then you could do without the fridge completely.... for milk

I was a big fan of ultra pasteurized when I was using a very poor propane fridge.

But I'm finding I can keep non-UHT for 2 weeks or more in summer in fridge0 when it's the same 0.01-0.5C as the thermal mass.

that does not need refrigeration either, does it? I've never seen it sold in the fridge area in supermarkets.

If i'm not mistaken you should refrigerate it once open.

Only after you open it.

The article is probably talking about "ESL milk" (extended shelf life), which is most fresh milk sold in Germany nowadays. It doesn't have the change in taste that UHT milk has compared to fresh milk. Because it keeps longer (up to 3-4 weeks) and doesn't taste different, it has replaced most non-ESL milk here.