That pronounciation sounds correct to me.
DVD VIDEO: The actual video that is put onto a DVD is stored at 480i most often. A 720x480 interlaced MPEG2 pattern with each 720x480 frame broken into two (interlaced) 720x240 fields. This is not HDTV, in fact it is a good deal below HDTV levels, yet it is, most often, very well compressed MPEG2 video and looks a lot better than regular television. It also is fairly easy to deinterlace and a good scaler can do wonders...
Which leads us to:
Your PC: Your PC has a video card in it. Most PCs have a halfway decent video card and then they connect a PC monitor using a digital connection (DVI most often) or RGBHV (VGA) analog connection. So, you have one of the best possible video connections available feeding a high resolution, and typically fairly small, high performance monitor. The video feed from your DVD in the PC is going to be fully processed by the video card and computer to the best possible output and will, quite often, produce results that can only be matched by $1,000+ DVD players. Kind of gives the PC an unfair advantage!
Your TV: When you feed a TV a high quality DVD signal it is important that the TV itself is up to the task, that you use the proper cabling, and that the DVD player in use is actually of decent quality. If you fail to do any of these three things then you will have a failure to achieve the best image possible. An older 480i only television will definitely be considered one of the failure points. Yet, when you put it all together, whether its a good plasma, a good RPTV, or a nice front projector, along with component or HDMI cabling, and a good Oppo, or nice Denon DVD player, you will have results that match (yes, just match) most decent PC setups.