I'd reached out to FLX with a few questions and thought I'd post their response here:
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Thank you for reaching out to FLX! Sorry we missed you on chat.
The M600 motors are equipped with the metal gears and do not have a brake sensor.
You must be going at least 6mph before the throttle will engage, everything on the Trail and Step-Through is pretty much the same, including the motor, LCD screen, shifters, gearing etc. The brakes are different though.
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I'd asked about brake motor cut out, so that what is meant by "brake sensor".
I thought that was a standard feature on ebikes but noticed no wiring coming from the brake actuators, only the hydraulic lines, so asked the question.
So there are some folks here that say the throttle works from a stop, but here FLX themselves state that is not the case...