Thank you, @LukeS !
Those 8 extra characters (ghcr.io/) made all the difference. 
Happy to report that after switching to the image hosted on GitHub’s container registry, the python script you provided worked as expected.
$./sensors.py
[LAMP Platform] SensorSpec Initialization Tool
You must enter your username, password, and server address to continue installation.
Username: admin [CANNOT BE CHANGED]
Password: ...
Server Address: api.mindlamp.temple.edu
Creating SensorSpec 'lamp.accelerometer'...
Creating SensorSpec 'lamp.accelerometer.motion'...
Creating SensorSpec 'lamp.analytics'...
Creating SensorSpec 'lamp.blood_pressure'...
Creating SensorSpec 'lamp.bluetooth'...
Creating SensorSpec 'lamp.calls'...
Creating SensorSpec 'lamp.device_state'...
Creating SensorSpec 'lamp.distance'...
Creating SensorSpec 'lamp.flights'...
Creating SensorSpec 'lamp.gps'...
Creating SensorSpec 'lamp.gps.contextual'...
Creating SensorSpec 'lamp.gyroscope'...
Creating SensorSpec 'lamp.heart_rate'...
Creating SensorSpec 'lamp.height'...
Creating SensorSpec 'lamp.magnetometer'...
Creating SensorSpec 'lamp.respiratory_rate'...
Creating SensorSpec 'lamp.segment'...
Creating SensorSpec 'lamp.sleep'...
Creating SensorSpec 'lamp.sms'...
Creating SensorSpec 'lamp.steps'...
Creating SensorSpec 'lamp.weight'...
Creating SensorSpec 'lamp.wifi'...
@khackett , I hope this helps get us past the sensor issues you encountered. Please test when you can and let me know if things are working as expected now.
Have a safe and happy holiday everyone.