it's not incorrect. carboys are not rated for pressure at all. However there are a lot of folks doing it without shattering carboys. A slightly safer way, although forgoing the benefit of only pushing with co2, is to use a sterile filter and blow into the other nipple to produce the positive pressure in the carboy. You probably don't even need the filter.
I typically use a aquarium pump set up to pressurize the carboy (better bottle) to start the siphon. When I used glass, this was my process, too.
I've done what Beersk does, too. But I'm not sure I ever did it with glass.
I think the glass would have to be substantially weakened already to explode from low pressure. But since glass spooks me out, I've moved to plastic.