This is utter crap/wrong.
Deck trending is as follows counting more than 1 million games
1. Even Palladin 60.07%
2. Odd Pallading 59.08%
3. Spitefull Druid 59.07%
4. Cube warlock 56.91%
5. Spitefull priest 54.45%
I don't know how they got those numbers. Also there are on the rise murloc palla, even shaman, odd rogue. Not enough games to be precise.
Mage has maximum 53.3% tempo mage ...wow. The 60% is from another game perhaps
So you have 30% chance to meet a paladin and 17% chance to meet a druid or warlock