Yes, but then why does he say 'keep in mind that the robot can be used by multiple people'. Is this any different than, say, two people sharing a pencil?

He's just pointing out that a business wouldn't need to contemplate buying a $15,000 anybot for each employee when they can be handed off depending on who needs it at any given moment.

Not sure why the author felt like pointing that out.

I assume he's saying there isn't a licensing restriction to have as many users as you'd like. Meaning, the client doesn't have to buy the hardware product plus a per-seat license.