No text, but a visual code

[Rafal]

It sounds like you're arguing for it being something like the Hildegard of Bingen (12th century) — Lingua Ignota

Lingua Ignota was an attempt at constructed language.

It was possibly never finished and only half-baked, unless some works of Hildegard were lost. We have a dictionary of 1000 words and a short Latin text mixed with some single Lingua Ignota words but not any single longer text in Lingua Ignota and not any hints about its grammar.

If I understand Antonio correctly, he doesn't suggest a constructed language but rather series of astronomical data written in some peculiar notation.
So it's not like Hildegard