That post makes no sense.
Regardless if batting or bowling, if you review a decision, it will be reviewed for ALL possibility of out. The only thing is, for an umpire's call decision. If it was given out for a specific decision, umpires call remains out. If given not out for a specific decision, umpire's call remains not out.
In this case, the umpire gave Misbah CAUGHT out. Clear evidence he was not caught out, so the review is OVERTURNED. Then they check for lbw, which was NOT given, and it was umpire's call, so it is not reversed and still not given LBW.
Was Misbah lucky, yes, but the rule is consistent. DRS was used properly.