However, since there was a significant form of textual analysis that predates Postmodernism it shows that forms of textual analysis have had later philosophical movements.
It also shows that Postmodernism itself is the second form of textual analysis in recent times which indicates that it is unlikely to be the final form of philosophy.
The other point about Postmodernism is that while texts are meant to be reinterpreted in any way the reality is that shallow readings of who the author was and what they like to do in the bedroom has been the primary result.
Not it doesent show that. The “conclusions” are more or less the same and non have had further developments inside their respective frameworks. I.e there isnt any critique of postmodernism that takes it further only back, there isnt any critique of zenbuddism that takes it further etc.
You could equally claim that all postmodern philosophy is really just Zen Buddhism reinterpreted.
I don't think it takes anything away from anyone.