There's more detail on his political/economic views in his book, 'Debt: The First 5000 Years':
Another of his books is titled, 'Toward An Anthropological Theory of Value: The False Coin of Our Own Dreams'. Its summary on Amazon begins: "This innovative book is the first comprehensive synthesis of economic, political, and cultural theories of value. David Graeber reexamines a century of anthropological thought about value and exchange, in large measure to find a way out of quandaries in current social theory, which have become critical at the present moment of ideological collapse in the face of Neoliberalism."
So I rather doubt from the title and the summary that we'd discover that he blithely accepts the core tenets of modernism. It appears to me that he probably would reject quite a bit of the core tenets of modernism and those that he accepts he probably does so understanding their roots and implications. Again, I can't be sure b/c I haven't read it but the guy assumes an outsider, iconoclastic stance in almost everything I have read.