Hence, the master is not literally "cut by hand," but the aspects by which it is made is weighed by human discernment.
Yes, the lacquer is not "cut by hand" in a sense that somebody is using a knife or chisel to manually cut it, but they operate a machine which does the cutting.
However the machine has parameters in which it works which can be influenced by the operator.
And there may even be EQs or compressors at work to alter the source signal which is fed into the cutting machine.
Yes - its obvious when you see a signature of the engineer literally cut into the master with a pin or something on the inner section of vinyls. I also mentioned locked grooves -
I also mentioned this "A vinyl record may be double-grooved, with the second groove containing the hidden tracks. Examples of double-grooving include Monty Python's 'three-sided' Matching Tie and Handkerchief, "
Hard to explain - but on one side are two spiral tracks - depending on where you place the stylus you get either one - a friend had this and its quite a shock when you think you're playing this and hear the 'alternative' track for the first time.
https://en.wikipedia.org/wiki/Hidden_track