Up until HDTV's started coming out, and the new plasmas, you really couldn't find a TV with a DVI hookup. In fact, you still gotta search for them.
He's probably talking about the RCA video input jacks instead of the S-video port.
Either way, it's pretty bogus. The signal going to a TV does not control the TV. The TV can only display an image at the capabilities of the TV not the vid-card. If the vid card is sending a signal at 75hz and the TV can only support 60hz, the image is going to come through at 60hz.
The only thing I CAN say is that TV's aren't meant to display static images for long periods of time, nor do they handle displaying white for a long periods of time. This is common on a computer, though, so you will be effectively hurting your TV by doing that.
Although monitors are so cheap right now, if you've got the money to fork out for a TV worthy of displaying computer screens, you might as well just by a monitor.