Stealing hands from SB

[Thomas Luice]

In the Winning In Tough Hold'em Games on page 69 Stox has given a "default" opening range in SB that doesn't involve pocket pair 22.

But on the page 90 the following hands: 22+, A7o+, K8o+, Q9o+, J9o+, A3s+, K9s+, Q8s+ and J9s+ are recommended to raise when playing against an aggresive opponent that over defends his BB.

I don't understand the following 2 points:

1. If 22 is not good enough for open raise against an unknown oppenent, why is it good for a over-defend-BB oppenent?

2. Why should I raise unsuited K8 while only call suited K8?