It doesn't seem to authorize expedition of the sponsorship except under the circumstances given and only if the case is clearly going to be approved. In the case of sibling sponsorship, which takes forever (basically, at least a decade), it's highly unlikely this will have any effect. Expediting an I-130 won't do too much; the priority date for the visa is still the date the petition is filed, not the date it's approved. The problem is the visa itself coming out years afterward, and in the case of people already here, the ineligibility to adjust once it does come out if they are out of status.