He's talking about the +15% modifier you can choose from special abilities in the begining. That would of been just too lucky I think.
Maxen
Once you get the terraforming tech that class 14 can be bumped all the way to 18. Planets as low as 11 can be bumped up to 15. Terraforming is very pricy though.
Here's something interesting, One of the special abilities I picked was luck and so far I've been very lucky. Earth got boosted to a class 35 planet. I've had two economic booms, two minor races came to me with tech they stole from my rivals. The star system price is a bit steep, but if you're far behind it can save your life. One of my last two remaining rivals got the random event to force it to go to war with the other destorying their alliance. If you ask me this is just
Last time I looked it was around 22 billion.
Well it's not all bad. I just had a random event on Earth that changed it to a class 35 planet! I've also had econamy booms as well.
What a bit of luck I have had on the game I'm playing right now. I got the random event that changes a planet to class 35 right on Earth. Apply soil enhancers and Habit upgardes to get up to class 41. Finaly shell out the bucks on terraforming to change it to 49! :D