Honestly, this could only be said by someone who had never met anyone whose spoken language hadn't been written. I personally know people who have recently done exactly this: Developed a writing system for a tribe of people who previously had no writing system for their own language. The people themselves are amazed to see their language written down. They have generally internalized the negative attitudes of the larger culture they live in toward their own language; they'll say things like (and this is going to be offensive, but again, it's them saying it about their own language, having internalized it from the larger African language groups around them), "I thought our language was just a monkey language". Seeing it written down gives them a sense of value and pride toward their own culture they've never had before. This is exactly the opposite of "the transfer of a dominant language to other people". On the contrary, it gives people a powerful tool to fight linguistic imperialism.