It's true the aerostatic lift would help here, but the Airlander 10 is not actually a lighter-than-air aircraft. It's a hybrid and requires aerodynamic lift from forward movement in addition to lift from its engine-driven propellers.

The hybrid approach is puzzling to me because there are a multitude of advantages to be gained by being fully lighter-than-air.

I can think of a couple of advantages of hybrids. You could unload cargo without the thing trying to shoot up in the air and a problem with airships in general is them being blown around by the wind which may be less bad with a smaller hybrids. Also if you emergency land the thing may stay there whereas a fully lighter than air one would tend to drift off.

Is 'not actually lighter-than-air' always true, or only when it is carrying 10 tons of cargo?

My understanding is that when talking about aircraft, "lighter-than-air" means that it's designed to require no additional lift to keep it aloft regardless of cargo. Anything requiring non-aerostatic lift would be considered a hybrid.

https://en.wikipedia.org/wiki/Aerostat

The majority of Hindenburg victims burnt to death - "riding the craft down" doesn't seem quite such an attractive option.

Well, obviously you don't want to hang around very long after its on (or even close to) the ground. IIRC, most of the burning deaths were crew-members in the upper parts of the ship who were either caught in the fire in its first stages or didn't have a way out even after it hit the ground. The lower decks weren't ignited till it hit the ground.

But the point is that "impact" wasn't a common cause of death for those who stayed in the ship until it was near the ground. Even when the lifting gas is being vented fairly rapidly, they tend to comedown at survivable speeds.

IIRC, most of the survivors simply waited near the bottom until landfall, then walked away. I think many of the victims had a choice between jumping or burning, but it definitely seems like a burning envelope is survivable if (your part of) the cabin doesn't catch.

Maybe the focus should have been on making the cabin nonflammable. Suspending the cabin with an air gap, and lining it (especially on top) with serious fireproof and heat-resistant lining, might have done the job.

The ones who burnt to death were trapped with no way out. They didn't have the choice to ride it down.

Those were were not trapped either survived or jumped too early.