yes - less camber means that when the car starts to slide, and body roll is reduced, the contact patch / tyre load, becomes more even. If you were to have camber set so even load is achieved under max cornering load, as you go past max load (and start to slip) the contact patch becomes worse, reducing grip further.
This is most effective on the driven wheels.
Gentlefoot is probably correct regarding slip angle and soft tyres, but I usually find higher pressure tyres brake traction much more smoothly, at least in the road cars. Reducing the wallow of the tyre just makes it skip around more predictably, for me.