It is certainly news to me that you can get yeast to survive in an environment with a high enough alcohol content for that to work without adding neutral spirits to the mix.

Heresy!!
I feel very skeptic about this as there is no control on the chemical make-up of the water. A small pH variation in water can result in a very different "beer".

Why add all that water? I will just drink the concentrate. That way we can bring more beer along

I had this same idea myself as a university student 17 years ago! Although, I envisioned a powder that you could just add to water rather than a concentrate. I've done home brewing but I don't have the chemical engineering degree. So excellent work Pat! :) I imagine it will never ever be as good as a conventional beer, however it is designed for completely different situations, where any beer is better than no beer. I also had the idea all those years ago that something like this would be great for the International Space Station - so the guys that are up there for like 6 months at a time could enjoy a few refreshing ales on their weekends off without all the weight of normal beer.

Anything that has to do with beer is a good idea. HA! Seriously though, I think its a great idea. It'll probably never quite taste like regular beer, but for hiking and camping or other situations, it should be just fine to have a beer at times when it otherwise may be unavailable, or just to heavy to carry around.

Slowburn they likely add extra, 90% of the alcohol, after the brewing.
I like the food chemical method of CO2 production. Fact is you could put it in any flavor you have in a sealed bottle using them without buying all that unless you want beer.
I'd guess they ferment the mash/wort? with just enough water for yeast to work, then after fermenting, squeeze/press the 'beer' out and add alcohol to bring it up to needed levels.

Wow.... talk about "high gravity"! Perhaps they should offer syringes as a standard accessory....
Back when I was camping and wanted a little help relaxing around the camp fire we just carried a flask of PGA. Everclear was a choice brand. We mixed in a little with what ever drinkables may be natively available or otherwise was packed in. Fresh picked blackberries crushed in spring water was a popular choice, as was campfire coffee.

I suppose this might be marketable for a short time, but I think in the not too distant future if we want cold beer at our remote campsite, we will have it flown in, and empties flown out with our personal drone/cooler from the back of our pickup once we send the coordinates on our cell phone.

Sparkling Beer doesn't sound all that bad for when you're out there in the wilderness.. the experience should reflect the rest of the experience.. crisp and fresh mountain air, clean mountain rivers and what-not.. I think it's a great idea really.

think of the commercial potential here - most soft drinks in bars/restaurants are transported as concentrate and mixed at the point of sale. Huge transport savings.
Given that far too much beer/lager is actually nasty tasting commercial rubbish (I wont name & shame, but you all know the ones), then who's going to notice the difference if its served ice cold and mixed at the point of sale?
This is going to be the 'norm' (sadly) in 10 years time. So I suggest you support your local brewers and stick to traditional real ale.