T'was out on me pushbike last night and experimented again. Nice downhill stretch, probably doing in excess of 20mph. Hands off bars, leaning left made me go left, leaning right made me go right. Simple as. In my view that's not counter steering which is soley via input through the bars, push/pulling in the opposite direction of travel - instead this is positive steering by leaning only. On my GSA I can do the same thing except the effect is much less and I can only induce a gentle turn, probably because of increased mass and wider tyres. Maybe this is linked to what people are suggesting happens with weight transfer on the pegs which my logic tells me would also have to include an element of lean in the process.
I completely understand the principle of counter steering and use it every time I'm out on the (motor)bike whether I realise it or not, but in my view, to suggest its the only influencing factor when cornering is simply wrong.