News Bluetooth device on Earth connects to satellite in orbit — Hubble Network's connection spans 600km with more to come

I have little problem believing a satellite can send signals to low powered bluetooth devices, but a low power bluetooth device talking back to the satellite? Those have to be some special signals that the satellite is sending and receiving. I'm skeptical.
 
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Radio communications can be done a longer distances with larger antennas and more power, but at lower speeds.

This article does not says hoy much lower are the speeds.