Well, does this advice hold for snowy terrain?
Today is my second day riding in snow this winter and still have the feeling that if I lean the bike, it will simply slide out under me. The tires are Schwalbe Land Cruiser. So I actually lean my body, keeping the bike as straight as possible through the turns. Exactly opposite to the general advice.
I am talking about 10km/h riding, and I already managed to fall a couple of times (luckily at those speeds falls are harmless, when outside traffic).
"On snow" for the purpose of this answer means autumn leaves, over which there are several cm of frozen, hard or melting snow.
I am fortunate that 1/3 of my commute is through a non-paved park, where I can practice funny things without the danger of being hit by a car. There are even some small (30cm) and other not so small ramps, but I haven't summoned the courage to jump those ... yet.