No, it's going from 1 in 100 to 7 in 100. 7x better is huge.
What's that got to do with the price of tea in 1st edition?
Page 92 under NPC statistics gives 3 main options for creating NPCs. Option 1 is to give them whatever stats they need, which presumes stats. Option 2 is to give them a monster stat block, which presumes stats. Option 3 is to build them like PCs, which presumes stats. All the first paragraph says is that you don't need to roll, and you don't. You have the options 1 and 2 for picking the assumed stats.