This is an attempt to eliminate the peelback block. Basically, an offensive player beyond the line can't block low if the direction of the block is back toward Team A's goal line. I believe this verbiage is just inferring that it doesn't matter at what angle contact is made, as long as the direction of the blocker's body is toward Team A's goal line, then it is a foul.
If the direction of the blocker is parallel to or toward Team B's goal line, then restrictions are based on the rest of the BBW rule.
I think.