Eh I don’t think it’s something we can ever discount. Some cavewoman could’ve daydreamed the entire theory of general relativity in her own private language while weaving a basket and we would never know because she never felt the need to talk about it. On the other hand there are people today who will emit novels of profound nothingness.

Technology and language is sort of like speaking in this sense, it’s evidence of mind but it’s not mind. And the absence of evidence is not the evidence of absence and all that