I don't see what's the huge (besides higher data rates and a different modulation waveform) difference between that 2017 paper and this 2002 one: http://applied

I don't see what's the huge (besides higher data rates and a different modulation waveform) difference between that 2017 paper and this 2002 one: http://applied-math.org/optical_tempest.pdf http://applied-math.org/optical_tempest.pdf Did we really need another "LEDs connected to serial lines / GPIOs can be made to blink arbitrarily and a camera/photodiode that looks at them can decode data" paper?