Yes that is about how it works but you are confusing orders with actual sales
The SETS machine receives orders from clients and it tries to match these orders and then makes a TRADE between a BUYER and a SELLER (Graftman take note!!) It is impossible to have more buys than sells
If I sell my shares who gives me the money?? here is a good guess the BUYER
Back to the original question then why are these figures published??
... quite some time ago I started to keep a record of AT trades because these can be assigned buy versus sell insofar as the order book is concerned but it turned out to be a lot of effort ... and one should not forget that MMs can keep long/short positions open for years .... I remember writing to the LSE at one point about these data .. but they would not release it ... because it is confidential .... which I suppose is fair enough.
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