I would like to clarify the different situations in which you would open raise by 3BB to steal instead of pushing with Sklansky-Chubukov numbers. I'm going to write down what I understand so far from the articles. Please correct any misconceptions that I may have.
The Sklansky-Chubukov numbers article says that hands that are easily played postflop should be raised normally and those that aren't should be pushed.
With this information in mind, we can categorise hands into 3 categories:
1) Premium hands as played by SSS (77+/AJ+/KQ)
2) Sklansky-Chubukov numbers (e.g. A2+,K2+,Q6s+ etc etc)
3) Stealing hands: Suited connectors (e.g. QJs, JTs, T9s - 54s)
Let's ignore (1) since we all know how to play them.
When our stack is <25 BB, we just push according to the Sklansky-Chubukov table - (2)
When our stack is >25 BB, we do a normal 3 BB steal, with a range dependent on our opponent's fold to BB stat. we also steal with suited connectors even if our stacksize is <25 BB.