When the radar setting is enabled, radars stop working entirely.
They no longer do long-range scans or close-range map revealing.

Not unexpected, the entire way radars function is that they scan a new tile when their energy buffer fills up from their standard energy usage. Removing the usage would also remove the buffer fill, preventing both functions. The mod actually sets it to 1W instead of 0, but the radar requires 250 kJ to reveal nearby, and 10 MJ per long-range scan, which would take about 116 days at 1W. To make radars continue to function with (nearly) 0 drain, the mod would also need to reduce the energy_per_nearby_scan, 1J would probably work, and then also reduce the energy_per_sector to around 30J.