It knows that because it knows the location of just about everyone with a cell Phone through their GPS app.
How many phones show up is a good indicator of how busy the restaurant is.
Decades ago people were concerned about someone/entity putting a secret tracking device in their vehicle or on them. Today people pay hundreds of dollars to buy and carry one themselves. ¯_( ͡❛ ͜ʖ ͡❛)_/¯
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