possible bug in Firebeetle-32 libraries/board definition

I may have found a minor bugette somewhere in the Arduino Firebeetle32 libraries ..
If I preprocess my sketch I get a line:
#define ARDUINO_ARCH_DFROBOT_FIREBEETLE -ESP32 1

I feel this should be ARDUINO_ARCH_DFROBOT_FIREBEETLE_ESP32 1

And then again, perhaps this is correct.