There’s quite a few out-of-the-norm assumptions in this.

1. Superhuman AI is inevitable.

2. Writing will become a bottleneck to communicate effectively with it.

3. Higher communication bandwidth would let us keep up with the machines.

4. Therefore with higher bandwidth humans could stay part of AI decision processes.

5. That makes it more “human”, as humans would be kept in-the-loop without becoming a bottleneck to be worked around.

6. If you let superintelligence write into your brain, that lets you merge with the machine.