If you are talking about the numbers the NZX (or other stock exchanges) try to provide in real time, this would be correct. Many shares are e.g. just traded internally at some brokers place - i.e. NZX can't possibly know about them before trading ... and they will never appear in their depth (not even historically) unless the trades are closed and later reported to the stock exchange.
If you are talking about the historic depth (i.e. shares traded yesterday or earlier), I would think that the latter number (of shares actually changing hands) would be accurate, because all trades (or ownership changes) will be reported to the stock exchange - just not in real time.
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