Absolutely not true according to a BOEING test pilot who posted on an aviation website I read over ten years ago.Everyone was discussing how reverser deployment had been handled in the sim.
Because of various interlocks and protection systems, we are assured that inadvertent full power reverse is impossible. A full reverse scenario would be almost impossible to occur- an idle reverse scenario is far more likely, and that could be handled.
A single warning light indication is so overwhelmingly likely to be an indicator fault that in the absence of any other indication of reverse, I think it would be criminal to go rejecting at high speed.