Xojo2024R3.1: how to convert the code using Mid

Question for gurus.
Following code worked in Xojo 2018:

If Mid > 0 Then //we have a record to update.
  Save
End If

I have no idea how that was supposed to work.
I understand that Mid() was deprecated and should be replaced by String.Middle() but as you see in the code above there were no parameters specified, no error.

Can someone explain to me if this code was “normal” in old days and what it means really?

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