There is a proper explanation of why Swift makes sense for TensorFlow at https://github.com/tensorflow/swift/blob/master/docs/WhySwif...
Just as one would take any marketing/promotional material for why a company's products are better than competitors with a grain of salt, and would want such material to be clearly marked as marketing material, I think bringing to light the author's relationship to the Swift helps, and does not hinder, further discussion.