> No, if one person "reinvents" a language, it's gibberish
By no means. There are degrees of reinvention, and a whole complex history of literary forms and cultural interpretation which that reinvention entails. But it doesn't happen by itself; subjects and subjectivities are required.
> Language is a social
> product through and through
But the history of every product cannot be separated from the class struggles of its producer(s) -- and one of those struggles is the struggle over the meanings of those products, i.e. the field of interpretation, ideology and theory. It's a question of setting the historicized object in motion towards the historical subject (as well as vice versa).
-- DRR