It is interesting - but dangerous rubbish- the sort of thing that justifies a lack of resonsibilkity and trendy consumerism and which has led to our current economic crisus and the consumerism that underlies global warming. Cultures always have been modified by trade have a study of Neolithis cultures par example.
History always has been biased Cf Eric Carr "What is History" The early historians acknowledged this so did the people . Historians were poets then for Chrissake..
But this stuff about master narrative and embracing pop=- culture merely destroys all cultures and such things as have made all cultures in their own territories at least powerful such as respect for human life and for sustaining traditions such as agriculture which does not destroy the environment or leach the soil.Clothes that last economies which stay within their budget and are not ashamed of of it-etc.
And also a tacit acknowledgement that there is such athing as truth though seldom pure and never simple as Oscar said