That's the point: the table never moves. You buy a table thats tall enough for comfortable standing use then buy a chair tall enough to that you never adjust the table. What's great about this is that there is no conscious effort needed to switch between sitting and standing you don't have to set a timer to remind you to stand up, crank your desk into standing position, nothing. You just flow on and off your chair.
If I could, every surface I owned would be adjustable height.
There are some merits to adjustable desks above and beyond that though.
If we wanted to do the same thing with a fixed desk, we would need some kind of platform for her to stand on, plus at least two adjustable-height seats with adjustable foot rests.