I think the question is relevant. It's not a matter of whether we can know (in the sense of have absolute certainty) that we have deciphered an ancient text correctly, but of whether it is possible to be wrong or right about whether we have deciphered its meaning. — Janus
Indeed.
If all we have is a previously unknown, never-before-seen, ancient text, then all we can be certain of is that that text was meaningful to the language community from whence it came. We cannot be certain about whether or not we - as interpreters - are drawing the same correlations between the text and other things.
Since all meaning consists of correlations drawn between different things, and all shared meaning consists of a plurality(within a community) of creatures drawing the same correlations between language elements and something else, then it only follows that we - as interpreters - cannot be certain that our correlations have the same content as the people from whence the writings came, because we have only the text.
As a result, we have no way to falsify/verify that we've drawn the same correlations between that text and the corresponding content within the original correlations drawn by the users.
That's an epistemological aspect.
If we accept that there can be unknown, but decipherable meaning, in other words that there can be meaning there to be deciphered, then that would seem to commit us to accepting that meaning is not merely in the human mind.
I am of the position that meaning is not merely of the mind(thought/belief), but there is no meaning without the mind(thought/belief). This could be further explained, if need be. For the purposes here, it seems unnecessary.
All meaning consists of correlations drawn between different things, and the drawing of correlations is existentially dependent upon a creature capable of drawing such. It only follows that all meaning is existentially dependent upon a creature capable of drawing correlations. No creature, no correlations. No correlations, no meaning.
The connection between language elements(signs/symbols/tokens/phrases/movements/what have you) and the corresponding content is made by the creature. When all the language users die, the connection between the text and it's corresponding content ceases to exist. Without the correlations, there is no meaning.
All interpretation is of that which is already meaningful. There is no interpretation possible of an ancient unknown text from a group of long dead language users. Such a text is meaningless.
That's an 'ontological' aspect.