I think the post conflates several quite unrelated concepts under the label text. Also what does he mean by text and information? For example he mentioned the "optical telegraph", which is a semaphore system which used a system of messages which AFAIK were not alphabetic text. Another example if we compare logographic language systems (e.g. Chinese characters, hieroglyphs ...) to alphabetic systems. I guess we can sa…
The pulses of light in an optical fiber are not alphabetic text either, but we are not talking about baseband here.