^^I read this a lot on hyperloop forums and articles, but it doesn't really matter. What pressure constitutes a vacuum ? What pressure do you mean by low pressure?
Zero pressure(perfect vacuum) is impossible to do in life. So what these articles/videos mean by vacuum is sufficiently low pressure that can reduce drag and that is essentially impossible to do across a tube of any meaningful size.
Incorrect. It's not "essentially impossible" as it's very far from a vacuum, or even a near-vacuum. The Hyperloop paper explains why it doesn't require high cost to build the tube or maintain the vacuum within with only pumps at the two ends of the tube.
Zero pressure(perfect vacuum) is impossible to do in life. So what these articles/videos mean by vacuum is sufficiently low pressure that can reduce drag and that is essentially impossible to do across a tube of any meaningful size.