I believe from what's previously been in the news about this "A-11" formation the players (except the snapper) all initially line up off the line. That leaves the maximum of 10 players as possible eligible receivers. Before the snap some subset of 6 of them shift up to the line which then defines the 7 lineman, and the 2 ends. At that time the 5 interior lineman become ineligible by formation. It basically means that until the final formation is set, which could be as late as 1 count before the snap, the defense is kept guessing as to which players will be eligible. In fact, depending on how they line up, the center could be on the end of the line and be eligible.
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