That number reflects positions for the June 28 Settlement Date.
If my understanding is correct it doesn't reflect trades on June 28, the day on which four or five million shares were transferred to the tracker funds. But it does rather look as though the Shorts didn't supply shares to the agents who were accumulating for the tracker funds in late June.
So who supplied all of those shares? When the institutional holders report their positions as at the end of Q2 we should know a little more.