I'm not sure what you're saying. StatsCounter (the source of the data) reported that Bing was briefly a more popular referral than Yahoo, but that the trend has now reversed. If you don't trust the June 4th data, I can't see how you can then accept the June 6th/7th data. The time span over each day is exactly the same.
TC is drawing conclusions based on one data point. I dispute how they are using the data, not whether that data is accurate.
I wonder if their CPM will go down as a result of all this hype-cycling.
My apologies, when you said "write a followup when better data proves it wrong," I thought you were suggesting that it was now good data.
The point is that the one day they were above yahoo is also the one day they launched, and got everyone trying it for the first time and tons of launch-day media coverage. The number could be 100% accurate, it still doesn't mean much.