I think he meant that it implies that an employer can pick a single therapist for all of their employees, and that there may be perceived pressure to see that therapist over others. In reality it can take quite a bit of visiting different people to find a therapist one feels comfortable with.
I guess you're right, it adds choice, but softly discourages you from seeing an outside therapist. Why not just see the company therapist? There is also some moral hazard involved.