Author mentions the uplink downlink would be the same since the speed of light hasn't changed. That's not really true. While NASA still has communication links

Author mentions the uplink downlink would be the same since the speed of light hasn't changed. That's not really true. While NASA still has communication links to spacecraft that use the same waveform that Apollo used back in the 60s, there are much higher speed links available. The uplink was limited to about 2kbps and that was with 5-to-1 encoding meaning it was more like 400bps. Downlink was either 1.6kbps or 51.6kbps depending on mode. They also had voice channels within this waveform along with a ranging code to determine how far away the spacecraft was. Spacecraft nowadays can use Ka-band communications. NASA pulled off over 500Mbps using Ka-band in 1997 and today there are demonstrations of gigabit links.