Why are you baffled? The 'starter set' didn't include this information and so made a fairly shit starter set to new players. Without it, the set was great for people who play already or who are coming across from 40k and can cope with the rules, but not for those who 'starter sets' are normally aimed at.
You would have had to read through the whole rulebook and guess half the equipment/levels of the mage/what the fuck so and so does. They saw the ranting on the net and listened. Good move GW, shame your designers slipped up in the first place though.