From the website of the manufacturer [1] it appears that the co-processor is essentially an analog computer for matrix-vector multiplications. I am quite sceptical about the accuracy and value range of the computations. Even puny single-precision floating point operations are accurate to something like 7 decimal digits and have a dynamic range of hundreds of dB. According to the spec sheet, the appliance only uses 6-bit inputs and 8-bit outputs, so the relative errors are probably on the percent level. This makes it hard to believe that any signal will propagate through something like a DNN without completely drowning in noise.
[1] https://lighton.ai/lighton-appliance/