Schaublin mill question

I was watching the youtube videos from This Old Tony and he mentioned his Schaublin mill has no quill at all, every control is done with the knee and table. So I was wondering, how does one use boring bars when the only way to advance the Z is raise the table? Because I know when you raise or lower the table with the knee it tends to wander in both the X and Y direction (and not show up on the DRO). Are Schaublins somehow able to eliminate this problem?

I think the mill in question is a Schaublin 13